422 CONNECTICUT GEOL, AND NAT. HIST. SURVEY [Bull. 



H. {Eriocera) tristis (Alex.) 



1914. Enocera tristis Alexander: l^roc. Aead. Xat. Sci. Pliiladelphia. 

 1914:602. 



Figs.-— Alexander, Psvche, 19, pi. 13, fig. 8 (wing) ; 1912 (as fnliqitwsa). 

 Alexander. Cfls. N. Y., 1, pi. 37, fig. 110 (wing) ; 1919. 



Mesonotum dark brown, the praesciitum with four slightlj^ darker 

 stripes, in cases with an additional capillary line on anterior half; 

 pleura dark brown. Antennae l)rown, the basal two se<rments more 

 reddish brown. Vertical tubercle entire. Knobs of halteres brownish 

 black. Femora yellow, the tips narrowly but conspicuously blackened. 

 Wings with stigma darker than the ground-color. Abdominal ter- 

 gites black, sternites weakly bicolorous, obscure yelloAv. their apices 

 broadly dark brown ; ovipositor with sclerotized valves. 6 . L. S-9 

 mm.; w. 8.5-9 mm. $. L. 11-12 mm.: w. 10-11 mm. 



(July, Aug.) Mass., N. Y., westw. to Ind., soutlnv. to Md. and ^'a. 



H. {Enocera) wilsonii (O, S.) 



1869. Eriocera irllsonii Oyten Sacken : Mon. Dipt. X. Amer.. 4:2.'"».'). 

 1900. E. arttennaria Doane; Journ. X. Y. Ent. Soc, 8 : 194. 



Figs.—Doane, Ibid., pi. 8, fig. 12 (wing) ; 1900. Alexander, Cfls. X. Y., 1, pi. o7 , 

 fig. 109 (wing) ; 1919. 



General coloration polished rusty-red, the praescutal stripes lack- 

 ing or very faintly indicated. Anteniuie ( $ ) with basal segments yel- 

 low, the outer ones black; flagellar segments provided only with erect 

 pale setae, no spinulae. Knobs of halteres weakly darkened. Legs 

 yellow, the tips of femora, tibiae and basitarsi blackened. Wings 

 with i?2+3 subequal to or longer than i?2 + :^ + 4; ni-cu some distance be- 

 yond fork of M. Abdomen reddisli yellow, i. L. T.5-8 mm.: w. 

 9-10 mm.; antennae. 14-16 mm. 



(May-July) Del., wcstw. to O., southw. to \'a. and N. C. 



7. Subtrihe Atarbaria 



Atarba O.sten Sacken 



1869. Atarha Osten Sacken; Mon. Dipt. X. Amer.. 4: 127-128. 



In our region, Atarha includes only the genotype, picticoi-n'ts. 

 The genus is very isolated in its affinities and it is by no means certain 

 that its present position in the Hexatomini is the correct one {I'ide. 

 Alexander, Diptera of Patagonia and S. Chile. 1:167: 1929; under 

 Ischnothrix). The chief structural j^eculiarity lies in the very large 

 meron which se{)a rates widely the middle and hind coxae. The tibial 

 spurs in the local species are small but perfectly distinct. The vena- 

 tion shows few distinctive features other than the loss of /?2 and the 

 presence of but two branches of Rs, both characters being shared with 

 Elephantomyia (Fig. 44, O, P). The antennae of picticornis are elon- 

 gate and bicolorous in the male .sex. The adult flies are not uncommon 

 in shaded open woods. The earlv stages occur in saturated decaying 

 wood (Rogers^ Florida Ent.. 10 : 49-55. flgs. 1-7; 1927). 



