FUNGUS GNATS OF NORTH AMERICA. 275 



that of the media. Halteres and legs yellowish, coxae cinereous, 

 tarsi fuscous. "Greenland." 



Riibsaamen (in Bibliotheca Zool. XX. 104, '98) describing 

 a specimen which he identifies with the above adds that the 

 flagellar joints are distinctly longer than broad, the tarsal claws 

 each have a basal tooth, and gives a figure of the wing in which 

 Sci ends proximad of the base of Ri ; Sc^ is distad of the middle 

 of Sci; petiole of M slightly longer than the crossvein; costa 

 produced far beyond tip of Rs, and cubitus forks under the 

 petiole of the media. Hypopygium as figured (Fig. 154). 



15. Boletina tricincta Loew. 

 Berlin. Ent. Zeitschr. XIII. 143. 1869. 



Male and female. Length 3.2 mm., wing 3.2 mm. Head 

 black, antennae fuscous black, scape and base of the flagellum 

 testaceous or subfuscous ; palpi yellow. Thorax and abdomen 

 shining black; abdominal sclerites 2-4 with yellow posterior 

 fascia ; venter except last 3 segments, yellow. Hairs yellow. 

 Hypopygium small, similar to that of B. dispecta Dzied. but 

 terminal appendages with 10 apical rays, and forceps dififer 

 (Fig. 157) ; lamellae of ovipositor pale. Coxae and legs yellow- 

 ish, trochanters with fuscous spot, tibial spurs dusky yellow 

 or pale ; tarsi except the base fuscous ; fore tarsi of the female 

 tumid. Wings grayish hyaline, heavier veins fuscous. Halteres 

 yellow. "Wis., Md." 



The intermediate antennal joints not twice as long as broad; 

 in the male one claw of the fore and middle feet, modified 

 scoop-like, fluted and with serrate margin, the other claws 

 sharp but with a serrate and scoop-like basal tooth ; in the 

 female each claw has a serrate basal tooth. Venation as figured 

 (Fig. 187). Selkirk Mts., B. C. (J.C.B.) ; Me. and Mass. 

 (C.W.J.) ; R. I. (J.B.); Wis. (W.M.W.) ; Ithaca, N. Y. ; 

 Brookside, N. J., (Weidt), July-Sept. 



16. Boletina sciarina Staeger. 

 Kroger. Ent. Tidskr. 236. 1840. 



Male and female. Length 3-4 mm. Wholly blackish brown ; 

 coxae, femora, spurs and halteres yellow; tibiae darker, tarsi 

 brown ; hind coxae and sometimes the others also more or less 

 blown. Anterr?: rf the niale from T.5-2 times as long as head 



