164 [June 



obsolete, quadi-ate, ferruginous spot on the disk of the mesothorax ; 

 scutellum rather flat, pale yellowish, shining, a short transverse line 

 of the same color just behind ; metathorax opaque black, with a sub- 

 obsolete, longitudinal, rufous stripe on each side ; densely and roughly 

 punctured, clothed like the head and thorax with short pale brownish 

 pubescence ; the elevated lines well defined, the central area lai'ge, 

 transversely subreniform, being broadly rounded in front and emargi- 

 nate behind. Wings subhyaline. with a flint violaceous and brassy 

 gloss ; nervures fuscous, pale at base, stigma ferruginous ; areolet 5-an- 

 gular. Legs yellow ; the four anterior coxjb black, more or less stained 

 with ferruginous beneath, as well as their femora beneath ; posterior 

 coxae black with a subobsolute rufous spot behind, their femora, except 

 their base and trochanters which are rufous, and the tips of their 

 tibiae, black. Abdomen dull ferruginous, the apical margin of each 

 segment with an indistinct darker stain, the basal half of the petiole 

 blackened ; first segment distinctly bilineated and finely aciculate ; 

 basal foveas of the second segment small, not deep, this and the follow- 

 ing segments densely and finely punctured, the punctures becoming 

 finer and the surface smoother towards the tip ; beneath, the basal seg- 

 ment is black, the disk of the second and third and the apical margin 

 of the following segments ai'e yellowish. Length 7.1 lines; expanse of 

 wings 12i lines. 



Hah. — Rocky Mountains, Colorado Territory. 



Resembles the two preceding species, but differs much in the distri- 

 bution of color, and especially in the shape of the central area of the 

 metathorax which in this species is transversely subreniform, while in 

 the two preceding species it is quadrate or subquadrate. 



4:1 Ich. animosus. n. sp. 



Black; face, dcutellum and legs in part, yellow; wings hyaline; abdomen 

 dull rufous banded with black; central area of metathorax elongate. 



Male. — Head deep black, shining; face beneath the antennae, fron- 

 tal orbits, clypeus, mandibles, except base and apex, and the palpi, 

 bright yellow ; antennae two-thirds the length of the body, black, basal 

 joint beneath bright yellow. Thorax deep black, shining, finely and 

 rather sparsely punctured ; tegulae, a short line before and a line be- 

 neath the wings, yellow ; scutellum rather flat, shining, entirely bright 

 yellow, except a sinuate line at base, which gives the yellow a cordate 



