74 AMERICAN DIPTERA. 



common Diptera noted in the caves. They were found in the 

 damper portions of nearly every cave visited, on the walls and roof. 

 They were never noted on the wing, except when disturbed, when 

 they would fly but a short distance before alighting." This refers 

 to defessa, pubescens and latens, as well as the above species. 



ECCOPTOMERA Loew. 



This genus, not hitherto reported from North America, but rej)re 

 sented in Europe by some nine species, is separated from Leria pri- 

 marily by the smallness of the eyes; the figure of our new species 

 illustrates this character. 



Chsetotaxy : one humeral, one propleural, one fronto-orbital, four 

 dorsocentral, no prescutellar, four scutellar, one presutural, two 

 notopleural, three supra-alar. The middle femur has an irregular 

 I'ow of rather striking bristles on the front side (in our species). 

 Arista always very long and thin. Antenmie small, far apart, with 

 small grooves below them, which are widely separated on the face. 

 Posterior cross vein forming an acute angle with the fifth vein 

 beiiind, but standing about at a right angle with the longitudinal 

 axis of the wing. 



Eccoptomera ainericana Darlinjiton, n. sp. (PI. IV, fig. 3). 



Length 6.7 mm. : of wing 6.7 mm. 



Yellow, including all the tarsal and antennal joints; abdomen more or less 

 blackish. 



Head yellow, two dark brown stripes running from the base of the occiput to 

 the vertex ; a tuft of small hairs parted in the middle at the base of the occiput ; 

 front somewhat safl'rou yellow, very slightly pubescent; antennae saflYon yellow, 

 the distal end of the second joint bordered with brown ; tliird joint scarcely 

 equaling in length the two preceding taken together, not infnscated ; arista long 

 and slender, not pubescent; cheeks straw color, about one and one-fourth times 

 the width of the eye; one strong vibrissa on each side, rather far apart. 



Thorax yellow; dorsum with very short and inconspicuous pubescence; dorso- 

 central bristles large and prominent; scutellum yellow, with sparse pubescence 

 besides the usual four bristles; mesopleura bare except three or four very small 

 hairs on the lower anterior corner; sternopleura with one strong bristle and one 

 smaller hair on the upper edge, sparsely pubescent below. 



Abdomen varying from yellow to blackish-yellow; the second, third and 

 fourth segments usually with a blackish posterior border; hyi)opygiun) yellow, 

 of medium size. 



Legs entirely yellow; pubescence very short and inconspicuous; the front 

 femora armed with two rows of strong bristles, one on the upper edge and one 

 on the lower; hind femora armed with some irregularly placed bristles. 



Three males, Moscow and Craig's Mt., Idaho (xVldrich). 



