524 



to apex of third, cross vein as in Figure 13, Plate XXXIX; cubitus 

 forking distinctly, Init not greatly, beyond apex of cross vein. 



Length, 2 mm. 



Type localitv, Muncie, 111., May 24, 1914; swept from vegetation 

 on bank of Stony Creek (C. A. Hart and J. R. Malloch). 



Female and early stages unknown. 



4. Orthocladius lacteipEnnis, n. sp. 



Male. — Black, slightly shining. Head yellowish; antennae, in- 

 cluding the plumes, black; palpi fuscous. Pronotum yellowish; 

 mesonotum black, yellowish on anterior lateral angles, disc with whit- 

 ish pruinescence which is distinct only when viewed from behind ; up- 

 per portion of pleurae yellowish centrally, the remainder, as well as 

 scutellum and postnotum, subshining black. Abdomen black, slightly 

 shining, posterior margins of last two segments narrowly pale. Legs 

 fuscous, tibice and tarsi paler. Wings whitish, veins almost colorless, 

 the thickened portion at base blackened. Halteres pale yellow. 



Antenna equal to length of head and thorax together. Pronotum 

 rather broad and of ec[ual width throughout. Hypopygium similar to 

 that of pilipcs, the extension of dorsal plate of moderate length, taper- 

 ing, armed with numerous hairs ; appendage on inner surface of 

 basal portion of lateral arm of moderate size, rounded ; apical portion 

 of lateral arm verv like that of nivoruindus. Fore tarsi without long 

 hairs, basal joint about three fourths as long as fore tibiae (26: 35) ; 

 fifth joint five sixths as long as fourth; empodium distinguishable, but 

 shorter than claws and very slender; mid and hind legs with short 

 hairs. Third vein almost straight, extending beyond beginning of 

 apical curve of wing; cubitus forking directly below cross vein. 



Length, 2.5 mm. 



Type localitv, South Haven, Mich., July 14, 19 14, on shore of 

 Lake Michigan (C. A. Hart). 



Female and early stages unknown. 



5. Orthocladius obumbratus Johannsen 



Orthocladius ohumhratus Joliamisen, Bull. 86, N. Y. State Mns., 1905, p. 281. 



This species differs from lactcipcnnis in being slightly larger, and 

 in having the wings and halteres slightly brownish and the basal joint 

 of the fore tarsi two thirds as long as the fore tibia?. The hypopygia 

 of the species of Orthocladius are almost identical ; in fact, through- 

 out the whole genus these organs show but little variation. 



Length, 3 mm. 



Locality, Ithaca, N. Y., April, 1902 (O. A. Johannsen). 



I have not seen this species from Illinois. 



