436 CONNECTICUT GEOL. AND NAT. HIST. SURVEY [Bull. 



G. {Lipo phle ps) sulphureWa O.S. (Fig. 47, H). 

 l,s.")9. (ronomyia siilphureUa Osten Sacken : Proc. Acad. Nat. Sci, 

 Philadelphia. 1859 : 230. 



Figs. — Osten Sacken, Mon. Dipt. N. Amer., 4, pi. 2, fig. 2 (wing) ; 1869. Need- 

 ham, 23rd Rept. N. Y. St. Ent. for 1907. pi. 24, fig. 3 (wing) ; 1908. Alexander, 

 Proc. Acad. Nat. Sci. Philadelphia, pi. 26, fig. 26 (wing), pi. 29, fig. 70 (hyp.) ; 1916. 

 Alexander, Cfls. N. Y., 1, pi. 36, fig. 91 (wing) ; 1919. Dickinson, Cfls. Wise, p. 196, 

 fig. 83 (wing) ; 1932. 



Rostniin black. Antennae with two basal segments light yellow, 

 fiagellum black. Head light yellow : center of vertex darkened. Mes- 

 onotum dark brown, scutellum yellow; pleura striped longitudinally 

 with sulphur-yellow and dark' pruinose. Halteres sulphur-yellow. 

 Femora with dark brown subterminal ring. Abdominal tergites dark 

 brown, the caudal margins of segments conspicuously yellow. $. L. 

 3.5-4 mm. ; w. 4-4.5 mm. 9 . L. about 4-4.5 mm. : w. 5-5.2 mm. 



(May-Sept.) Ont., Que., N. B., N. S., Me., N. H., Vt., Mass., R. I., N. Y., N. J., 

 Pa., westw. to Wise, Kan. and Tex., southw. to Ga., Fla., Ala. and La. 



Connecticut.— East River, Julv 11, 1910 (Ely): Granbv, June 8. 1929 (C. P. A.): 



Hamden, Julv 8-Sept. 5, 1932 (N. T.): Kent Falls, Julv 23-24, 1931 (C. P. A.); 



Manitic Lake, Aug. 6, 1929 (C. P.A.): Middletown, June 17, 1909 (C.W.J.): 

 Saptrec Run State Park, June 14, 1933 (C. P. A.). 



Subgenus Idiocera Dale 



LS42. LimnoUa {Idiocera) Dale: Ann. Mag. Xat. Hist.. 8:431. 433. 

 1913. Ptilostetia Bergroth: Ann. Mag. Xat. Hist.. (8) 11:575-576. 



Key to Species 

 (Based in part on male characters) 



1. Wings lieavily patterned with dark brown, especially in the outer radial field 2 

 Wings immaculate, except for the feebly indicated stigmal area 3 



2. Male hypopygium with the outer lobe of basistyle short and stout, shorter 



than the outer dististyle; inner dististyle as shown (Fig. 49, D) blanda 



Male hypopygium with the outer lobe of basistyle long and slender, longer _ 

 than the outer dististyle; inner dististyle as shown (Fig. 49, E) gaigei 



3. Male hvpopvgium with the outer arm of middle dististyle less tha\i twice 



the flattened, paddle-shaped inner arm ; inner dististyle with the spine at 

 extreme apex; aedeagus not blackened and spinous at tip, the- apex (urved 



into a weak beak-like crook (Fig. 49, C) apicispina 



Male hypopygium with the outer arm of middle dististyle a long slender spine, 

 the inner arm correspondingly reduced in size ; inner dististyle with an 

 acute spine on lateral margin at near two-thirds the length ; aedeagus 

 conspicuouslv blackened at apex, bearing powerful paired spines before 

 tip (Fig. 49, F) mathesoni 



Gonomyia (Idiocera) apicispina Alex. (Fig. 49, C). 

 1920. Gonorn^iia. {Ptllostena) apicispina Alexander: Insec. Inscit. 

 Menst. 14:117-118. 



Very similar to inathesoni^ differing especially in the structure of 

 the male hypopygium (Fig. 49, C). $. L. about 4 mm.; w. 5.2 mm. 

 9 . L. about 5.8 mm. ; w. 6.3 mm. 



(June) Tnd. 



