598 PROtEEDINGS OF THE ACADEMY OF [Oct., 



elongate rostrum, from whicli character Coquilk'tt evidently derived 

 the generic name. 



Genus TRICYPHONA Zctterstcdt. 



1838. Tricijphotia Zetterstoilt: Ins. Lapponica, Dipt., p. Sol. 

 Trioypbona katahdin sp. n. 



Color light brown; wings light yellow with sparse brown seams 

 and spots ; cross-vein yn-cu lacking. 



Male, length, 6-7.6 mm.; wing, 6-6.9 mm. 



Female, length, 8.8-9.5 mm.; wing, 7.5-9 mm. 



Palpi dark brownish black, rostrum and head brownish graj', 

 elearer gray on the vertex adjoining the eyes; first segment of the 

 antenniE pale yellow, remainder of the antennas dark brown. 



Mesonotal prajscutum light fawn-brown with an indistinct brownish 

 strips on either side of the middle line and shorter lateral pale brown 

 stripes, these latter continued caudad onto the lobes of the scutum; 

 scutellum grajish; postnotum light yellowish brown with a whitish 

 bloom. Pleurse light yellow. Halteres pale, the knob a little 

 darker. Legs yellow, coxa; and trochanters browiiish yellow, femora 

 yellow darkening into brown on the apical half or more, tibiae and 

 tarsi dark brown. Wings light yellow, the veins yellow; small 

 brown markings as follows : a rounded spot on Sd continued up into 

 the costal cell; an oval spot at Sci; brown seams at the base of Rs, 

 base of fis+s, cross-vein r, tip of R^.^z, fork of jRj+s, cross-vein r-m; 

 venation (PI. XXV, fig. 7) : cell Rt much shorter than cell Ri, usually 

 one-half as long; cell M, very short usually about equal to its petiole 

 beyond cross-vein m or a little longer; cell 1st Mi very long, narrow; 

 Cui and Ms fused for a distance obliterating cro.ss-vein m-cu. 



Abdominal tergites v<\t\\ the basal two-thirds brown, apical third 

 yellowish; sternites dull brownish yellow, margined laterally with 

 brown, the apical segments with the margin reduced or lacking; 

 hypopygium pale. 



The female is similar to the male, but larger, especiallj- the abdomen; 

 brown tips to the femora narrower; abdomen usually with more 

 yellow color, often with a broad median patch of yellowish on the 

 tergites. 



In some of the males the scapal segments of the antenna? arc dark 

 brown, concolorous with the rest of the antennae. 



There is some variation in venation in the series, the fusion of 

 M, and Cui is sometimes lacking, the cros.s-vein m-cu being present 

 a-s in vcrnalis Osten Sacken; one female lacks cross-vein m in both 

 wings. 



