June '02] ENTOMOLOGICAL NEWS. 171 



(Bing. ), the species above described seems to answer all the 

 generic characters given by the authors of the genus. 



I take pleasure in dedicating this species to Prof. T. D. A. 

 Cockerell. 



Dianthidium balli n. sp. 



9 . Black ; with dark rich yellow markings, head and 

 thorax densely uniformly punctured, abdomen with punctures 

 of apical margins of segments dorsally smaller and denser than 

 on basal margins ; the clypeus, excepting an inverted T in the 

 middle, anterior orbits of eyes narrowed at tip above and line 

 leaning away from eye ; wide line continuous over occiput and 

 extending down about half way on each side ; spot on posterior 

 orbit about half way up from end of line to base of eye ; line 

 on each side of mesothorax, tegulse anteriorly, spot below, four 

 short lines at scutellum, apical ends of posterior and middle 

 femora, tibiae and first joint of tarsi anteriorly, all dark yellow ; 

 remainder of tarsi ferruginous ; tip of tibiae exteriorly with a 

 ferruginous spot on the middle, anterior tarsi strongly ferru- 

 ginous, a short blunt spine at apex of first segment ; claws 

 partly black ; bands on segments 1-5 narrowly interrupted in 

 the middle and that on first segment notched laterally behind, 

 on last segment broadly interrupted in the middle, yellow ; last 

 segment deeply notched behind with a shallower notch on each 

 side ; pubescence on face, cheeks, occiput and thorax above, 

 ochraccous; pleura densely, base and venter of abdomen and legs, 

 except tarsi, with white pubescence ; tarsi ferruginously haired ; 

 dorsal abdominal segments above with scattered white pubes- 

 cence ; wings smoky, tips less densely so ; second recurrent 

 nervure entering close behind end of second submarginal cell. 

 L/ength 14 mm. 



Described from one female specimen taken at Ridgeway, 

 Colo., July 31, by Prof. E. D. Ball, after whom I have named it. 

 This species is quite close to venustum, but differs in color, mark- 

 ings and their positions and is larger. The labial and maxil- 

 lary palpi show this to belong to the genus Dianthidiiuu Ckll. 



NOTE The above descriptions are extracted from an unpublished 

 thesis of the author's deposited with Sec'y State Board of Agriculture of 

 Colorado, May i, 1901. 



