4 University of MicJiigan 



from Guatemala and even further south to Canada. The 

 specimens in this collection are above average size. 



Eras tuberculata Coquillett. — The male of this species has 

 three prominent tooth-like extensions on the ventor of the 

 abdomen; size rather small and slender; second submarginal 

 cell of wing much less than half as long as the first. The fe- 

 male is like the male but without the ventral extensions on the 

 abdomen. Three specimens. The type material of the species 

 was procured at San Diego and Brownsville, Texas. Coquillett's 

 description was published in the Journal of the New York 

 Entomological Society, 1904. \'olume XII, page 34. 



Erax armatus, new species. 



Description : This is a rather robust, dark colored species, 

 in large part covered with gray pollen ; the legs are generally 

 black, but all the tibice are red on basal two-thirds to three- 

 fourths, ^lystax pale yellow, wings hyaline, second submarg- 

 inal cell short, much less than half as long as the first. Thorax 

 gray, with some narrow longitudinal markings. Length in- 

 cluding genitalia, male 30 millimeters, female 32 millimeters. 



3.1ale. — Costa slightly thickened at about two-thirds of the 

 distance from the base to the apex of the wing. Hind tibia 

 wnth a triangular enlargement posteriorly near its middle. 

 First abdominal segment gray, second gray at the sides and 

 behind, leaving a large black triangular s]J0t with its base on 

 the black spots are smaller and more rounded; sixth segment 

 like second, except that the black spot on the sixth is much 

 reduced; seventh segment uniformly gray. Hypopygium 

 large, black and clothed with black hair. 



Female. — Costa not thickened. Hind tibia not modified. 

 B'irst five abdominal segments colored much as in male, but 

 the black spots are smaller and more rounded ; sixth segment 



