Comprehensive Description

provided by Smithsonian Contributions to Zoology
Notiphila (Dichaeta) bispinosa Cresson

Notiphila (Agrolimna) bispinosa Cresson, 1917:58.

TYPE-MATERIAL.—Holotype male: “Barnegat City Ju(nction). VIII-11-10., N.J./ /TYPE Notiphila BISPINOSA, E.T. Cresson, Jr. 6114.” The holotype is in the Academy of Natural Sciences of Philadelphia, type number 6114. Cresson's original DESCRIPTION cites H. S. Harbeck as the collector of the type although the type does not have any indication of a collector. Cresson also listed a male paratopotype.

DIAGNOSIS.—Specimens of this species are very distinctive and are not likely to be confused with those of any congeners of the subgenus Dichaeta. Specimens are similar to those of N. furcata in the development of the secondary male sex structures of the fourth and fifth abdominal terga, although they are not as elaborate or as well developed. The posterior end of the fifth tergum does not project backward into a slender process, but it does bear 2–3 terminal bristles. Moreover, the large bristles along the posterior margin of the fourth tergum are not as strongly developed nor as numerous as those of N. furcata males. The antenna of N. bispinosa members is entirely yellow and generally there are fewer aristal branches. The hypandrial process of N. bispinosa males differs in several details from that of N. furcata males. For a comparison, see Figures 124 and 130.

DESCRIPTION.—Moderately small to moderately large shore flies, length 2.86 to 4.15 mm; with olive brown to grayish brown coloration and brown markings.

Head (Figure 123): Head ratio 1:0.75; postfrons ratio 1:0.59; lateral margins and median triangular area of frons concolorous, light brown, pollinose; remaining area of frons blackish gray with some metallic green luster. Paravertical bristle large, much larger than postocellar bristles; 2 pair of proclinate, fronto-orbital setae. Antenna entirely pale, yellow but sometimes with darker discoloration on third segment; usually 8–10 dorsal aristal branches. Face cinereous to niveous; prefrons ratio 1:0.67; facial setae small, hairlike. Eye ratio 1:0.81; eye-to-cheek ratio 1:0.16. Genal bristle subequal to paravertical bristle; gena not sharply contrasting with facial color. Maxillary palpus pale, yellow.

Thorax: Mesonotum immaculate, olive gray anteriorly, becoming light brown posteriorly. Mesopleuron with a brown maculation spot; pleural areas generally lighter in color than mesonotum, but becoming grayer ventrally. Femora grayish black; front tibia darkened, black although with pale, yellowish apices; middle and hind tibiae and all tarsi pale, yellow. Setal fascicle of hind basitarsus entirely pale. Wing ratio 1:0.40; costal vein ratio 1:0.53; M1+2 vein ratio 1:0.95.

Abdomen (Figure 125): Abdomen ratio 1:0.71; length of fourth tergum to fifth tergum ratio of males 1:0.95; fifth tergum ratio of males 1:0.60. Fascia of abdominal terga light brown, but contrasting with gray, ground color; fascia extending to lateral margins and on ventral surfaces. Posterior margin of fourth tergum with 7–9 large bristles, almost twice the length of fourth tergum; 2–3 stout bristles (Figure 125). Male terminalia as in Figures 124, 126.

SPECIMENS EXAMINED (403).—CANADA: NOVA SCOTIA: Backman's Beach (CNC), Lockeport (CNC), Petite Riviere (CNC), Petpeswick (CNC), Smith's Cove (CNC, USNM). PRINCE EDWARD ISLAND: Alberton (CNC). UNITED STATES: CONNECTICUT: Fairfield Co., Westport (ANSP); Middlesex Co., Plum Bank Beach (CU); New Haven Co., Guilford (CU); New London Co., Mystic (KU). DELAWARE: Bombay Hook (CU); Saint Jones River (CU); Woodland Beach (CU); Sussex Co., Lewes (KSU). FLORIDA: Levy Co. (FSCA); Manatee Co., Bradentown (CAS); Saint Johns Co., Crescent Beach (CU), Saint Augustine (ANSP, MCZ). GEORGIA: Barn Co., Espelo I. (USNM); Chatham Co., Savannah (WSU); Glynn Co., Brunswick-Torras Causeway (CU), 0.3 km W Jekyll Island (CU); Liberty Co., Saint Catherines Island (AMNH); McIntosh Co., Sapelo Island (UG, USNM). LOUISIANA: Cameron Parish, Cameron (ANSP, OHSU), 9.7 km S Hackberry (WNM); Saint Tammany Parish, 10.5 km W Rigolets River (CU). MAINE: Trenton (USNM, ANSP); Hancock Co., Mount Desert (MCZ, USNM); Lincoln Co. (OHSU, USNM), Medomak (OHSU); Washington Co., Machias (ANSP, MCZ). MARYLAND: Seaside (ANSP, USNM); Calvert Co., Chesapeake Beach (ANSP, USNM); Dorchester Co., Lloyds (USNM); Saint Marys Co., Piney Point (USNM), Saint George Island (USNM). MASSACHUSETTS: Naushon Island (USNM), Pasque Island (USNM); Welfleet (USNM); Woebecker Island (USNM); Barnstable Co., Falmouth (USNM); Eastham (ANSP, CNC, CU), North Falmouth (USNM), Mashpee (USNM), Pocasset (USNM), South Yarmouth (USNM), Woods Hole (ANSP, USNM); Bristol Co., New Bedford (MCZ, USNM); Essex Co., Ipswich (CAS, MCZ, USNM), Lynn (ANSP); Nantucket Co., Nantucket (MCZ). NEW JERSEY: Anglesea (ANSP), Ducan Island (AMNH); Cape May Co., Cape May (ANSP, MCZ), Stone Harbor (ANSP), Wildwood (ANSP); Mercer Co., Trenton (USNM); Monmouth Co., Morganville (AMNH); Ocean Co., Barnegat City Junction (ANSP), 4.8 km S Tuckerton (USNM). NEW YORK: Jamaica Co., Howard Beach (UMN); Nassau Co., Jones Beach State Park (MSU), Long Beach (USNM); Richmond Co., Staten Island (USNM); Suffolk Co., Babylon (CU), Cold Springs Harbor (AMNH, ANSP, CU, FSCA, USNM). TEXAS: Galveston Co., Dickinson (ANSP). VIRGINIA: Accomack Co., Assateague Island (WNM, CU), Chincoteague Island (CU), Eel Creek Marsh-E. of Chincoteague (CU); York Co., York River (ANSP).

GEOGRAPHIC DISTRIBUTION (Figure 127).—Notiphila bispinosa occurs along the Atlantic and Gulf Coasts of North America. Collection dates are from 27 March to 8 September.
bibliographic citation
Mathis, Wayne Neilsen. 1979. "Studies of Notiphilinae (Diptera: Ephydridae), I: Revision of the Neartic Species of Notiphila Fallen, Excluding the Caudata Group." Smithsonian Contributions to Zoology. 1-111. https://doi.org/10.5479/si.00810282.287