No. 3.] HYGROCELEUTHUS AND DOLICHOPUS. 



'39 



FIG. 15. D.calainus: hypopygium. 



patches of black hairs ; internal appendages light brown. Lamellae small, 

 strongly infuscated, lighter at middle ; with a narrow black border which is 

 much wider on the lower corner ; fringed with black bristles which are 



slender, especially on the upper edge. Pleu- 

 rae very dark green, grayish dusted. All 

 the coxae black. The anterior ones silvery 

 in front and covered with short black hairs. 

 Legs black, slightly whitish dusted. The 

 anterior tibiae dark brown on the inner side. 

 All the femora at extreme tip, the tibiae at 

 extreme base and the first joint of anterior 

 and middle tarsi at extreme base, yellow. 

 Wings hyaline, the veins black. Costa with a knot-like swelling at junction 

 of humeral vein. Tegulae and halteres yellow, the former with long black cilia. 



Described from one male specimen collected by Dr. Wm. M. 

 Wheeler in Chicago, May 8, 1896. 



This species is related to myosota O. S., but may be dis- 

 tinguished by the lamellae of the hypopygium, which are larger, 

 darker, wider, and distinctly angulate below. 



DolicJiopus eniguia, sp. nov. 



Dark green, shining ; wings brownish in front ; tegular cilia black ; cilia 

 of inferior orbit pale ; femora black, hind pair of male not ciliated ; fore 

 tibiae brownish-yellow ; lamellae of 

 hypopygium subrectangular. 



Male. Length 4 mm., of wing 

 3.5 mm. Bright green, not very 

 shining. Proboscis and palpi pice- 

 ous. Face rather wide, covered with 

 dense silvery dust, brownish in cer- 

 tain lights. Antennae totally black, 

 sericeous, but little hairy above. 

 First joint long, second and third 

 taken together, about twice the 

 length of first. Arista less than 

 twice as long as antenna, black, but 

 little pubescent. Front dark green, 

 not very shining. Postocular cilia 

 black above and pale below. Dor- 



sum of thorax and scutellum bright 

 green, somewhat cupreous in front. 



FIG. 16. D. enigma, male; D. ovatus, male. 



Abdomen dark green, bronzed, not 



so bright as thorax ; covered with black hairs throughout and white dusted 



on sides and below. Incisures between 



segments black. 



Hypopygium 



