FUNGUS GNATS OF NORTH AMERICA. 299 



as the tibia; the black tibial spurs about 1-2 as long as 

 the corresponding metatarsus ; coxse and femora with black 

 setae which are longer and more conspicuous on the outside 

 near the tip ; tibial setae small ; empodium very distinct ; tarsal 

 claws each with large tooth near base. Wings extend beyond 

 tip of abdomen ; hyaline, veins yellow ; venation as shown 

 (Fig. 216). Halteres yellow. Friday Harbor, Mt. Rainier, 

 Wash., July and August. (Aldrich). 



17. Genus Docosla Winnertz. r 

 Verb. Zool.-bot. Ges. Wien. XIII. 802.^1863. 

 Ocelli 3, the middle one smaller, the laterals close to the eye 

 margin. Thorax large, short; abdomen short. Legs strong, 

 particularly the hind pair. Wings large, broad, longer than 

 the abdomen ; costa produced beyond the radial sector. Sub- 

 costa ends in Ri or ends free; basal section of the radial sector 

 nearly perpendicular in position, the second section in the same 

 right line with the R-M crossvein which is longitudinal in posi- 

 tion ; base of fork of cubitus under or proximad of the fork 

 of the media (Fig. 218). 



Table of species. 

 a. Abdomen reddish yellow, thorax shining black. i. dichroa. 



aa. Abdomen black. 



b. Subcosta ends in Ri. 



c. Media and cubitus fork about opposite the base of the radial 

 sector; third antennal joint only slightly longer than broad. 



2. obscura. 

 cc. Media and cubitus fork noticeably proximad of the base of the 

 radial sector; third antennal joint about twice as long as 

 wide. 3. nigella n. sp. 



bb. Subcosta ends free, its basal section strong, apically much atten- 

 uated ; legs mainly dark brown. 4. nitida n. sp. 

 For D. longicornis and vittata see Syntemna. 



I. Docosia dichroa Loew. 

 Berlin. Ent. Zeitschr. XIII. 148. 1869. 

 luutor, Adams: Science Bui. Kas. Univ. II. 24. 1903. (Syn- 

 temna): 



Male and female. Length 3-3.5 mm. Head and antennae 

 black, palpi fuscous or subfuscous. Thorax wholly black, 

 shining. Abdomen reddish yellow in the male, the last two 



