128 MAINE AGRICULTURAL EXPERIMENT STATION. I912. 



hind tibia and tarsi subequal. Hypopygium black, subglobose, 

 clasper (Fig. io6). Wings grayish hyaline, anterior venis dark 

 (Pig. 225). Wis.! (W.M.W.). 



Female. Length 4 mm. Colored like the male but the an- 

 terior cells of the wing more smoky. Ithaca, N. Y. June. 



14. Sciara imitans n. sp. 



Male. Length 2.8 mm. Black, thorax shining, fore coxae 

 yellowish, hind coxae and legs brownish, tarsi darker; hind tibia 

 and tarsi subequal, antennae about half the length of body; 

 Hypopygium black, robust, subglobose, clasper (Fig. 107). 

 Wings grayish hyaline, anterior veins dark (Fig. 226). Resem- 

 bles 5*. dux but differs chiefly in the form of the mesal process 

 of the claspers. Friday Harbor, Wash. (J.M.A.) May. 



15. Sciara prolific a Felt. 



Rept. State Ent. N. Y. XH. 226. 1897. 



Male. Length 2.8 mm. Black, subopaque, the scape and the 

 dorsal surface of the prominent hypopygium dusky yellow ; 

 clasper (Fig. 108) ; antennae about 1-2 the length of the body; 

 the narrow hind margins of the abdominal tergites sometimes 

 distinctly cinereous ; halteres, coxae and legs yellow, the hind 

 coxae and tarsi more dusky; trochanters black. Wings grayish 

 hyaline, the veins fuscous (Fig. 227). Id., Wash., (J. M. A.). 

 Ithaca, N. Y. 



The type specimens (balsam mounts) are 4.4 mm. long. 

 According to Dr. Felt's description the knob of the halteres are 

 fuscous and coxae and legs are darker, otherwise there are no 

 differences. 



Female. Like the male but slightly larger. "Mass." 



Var. a. Male. As above with the wings more heavily shaded 

 (Fig. 228) and petiole of the cubitus over .8 as long as the basal 

 section of M. Ithaca, N. Y. 



Var. b. Male and female. Cubitus like in Var. a, otherwise 

 as in the typical varietv. S. D.. Cal.. (J.M.A.) ; R. I. (J.B.) ; 

 Selkirk Mts., B. C. (J.C.B.). 



16. Sciara silvestrii Kieffer. 



Bol. Lab. Zool. Scuola d'Agr. Portici IV. 327, 1910. 

 Female. Length 4 mm. Dusky red, antennae brown, legs 



