382 CHARLES T. BRUES. 



male moderately large, black, with several small chitinous appendages more or 

 less concealed. 



Length 1.8 to 3.5 mm., of wing 2-3.7 mm. The smaller measurements belong 

 to the males. 



Seventeen specimens; nine from Lawrence, Kans. (a pair taken in 

 copulation, June 2, 1893, measure 1.8 and 3.4 mm.) ; two from Mil 

 waukee, June 28, '95; one Wisconsin, (Wheeler) ; one Natrona, 

 Pa., July 12; "95 (Johnson) ; one Pine Lake, Wisconsin (Wheeler) ; 

 one Austin, Tex. (Melander) ; two Woods Hole, Mass. (Brues). 



All of these agree perfectly with European specimens determined 



by Strobl. 



Pachyneiirella gen. nov. 



Head small; front short, twice as wide as long; with three rows of bristles, 

 the two upper ones of four each, the next of only a single bristle at each side, 

 besides two pairs of small proclinate bristles below. Antennae with a perceptible 

 point at the upper corner where the arista is inserted. Palpi normal, bristly. 

 Tibiae without setae, even those at the apex being extremely minute. Third 

 vein of wing not forked, first vein ending less than half way from the humeral 

 to tip of costal; auxiliary vein distinct but short, ending in the first vein as 

 usual, fourth to sixth veins very distinct, about half as heavy as the third vein, 

 with which they appear to effect a direct union, instead of arising as a thin 

 streak parallel to it; seventh vein distinct but lighter. Costal vein reaching to 

 about half the length of the wing, ciliated with fine hairs not bristles. Empodia 

 and pul villi present, the former pectinated as in the female of Wandolleckia. 

 Anal angle of wing without any bristles. 



The heavy fourth to sixth vein, simple third vein and absence of 

 tibial spurs are the main characters. 



Pachjiieurella venata Aldrich. (Plate ix, figs. 58, 59.) 

 Aid rich, Trans. Lond. Ent. Soc, part iii, 436 (1896) (Phora venata). 



Male. Head and abdomen black ; thorax brownish black ; legs, including tarsi 

 yellow; femora a little darker. Palpi brown, antennae piceous, with strongly 

 pubescent arista. Bristles of front small except on the vertex. Halteres very 

 large, brownish black. Dorsum with one pair of dorsocentral macrochaetae and 

 two pairs of marginal scutellar bristles. Under surface of fore femora with a row 

 of delicate curved hairs. Pleurae yellowish below. Hypopygium brown, with 

 two black projecting claspers below, of which the left is fixed and the right mov- 

 able ; with a brownish lamella or backwardly projecting portion which is bristly. 

 A yellow band just preceding the hypopygium at the tip of the last abdominal 

 segment. 



Length 1.3 mm., of wing 1.1 mm. 



One male; St. Vincent, W. I. The type specimen, belonging to 

 the Entomological Society of London. 



