HEMIPTERA OF COLORADO. 63 



Boulder, September 4tli; Fort Collins (Baker). 



Ambrysus signoretii Stal. 



Fort Collins, August 11th (Baker). 

 Za-itha niicraiitula Stal. 



Fort Collins, August 27th (Gillette) . 



Belostoiua aiuericainiui Leidy. 



Occasional about electric lights at Fort Collins (Baker). 



Belostoma annulipes H. Schf. 



Pagosa, September 5th (Yarrow—see Uhler, 7). 

 Ranatra qiiadridentata Stal. 



Fort Collins, August 27th (Gillette). 



Notonecta insulata Kirb. 



Mountains, July (Carpenter— see Uhler, 6). Quite common in several pools 

 of water standing in hollows near bed of creek on outskirts of Denver, August 

 4th and 5th (Uhler, 5). 



Fort Collins, August 27th (Gillete). 

 Notonecta mexicana A. and S. Det. by Osborn. 



Fort Collins (Gillette). 



Notonecta iindiilata Say. 



In several pools of water standing in hollows near bed of creek on outskirts 

 of Denver, August 4th and 5th. Not so common as N. insulata (Uhler, 5), 

 Larva, nymph and imago from Sloan's Lake, west of Denver, July 10th 

 (Packard— see Uhler, 5). 



Fort Collins, August 27th; foot-hills five miles west of Fort 

 Collins, April 20th (Gillette) . 



Corisa calva Say. 

 Fort Collins, August 27th (Gillette). 



Corisa expleta Uhler n. sp. 



"Olivaceo-fuscous at)o%^e, form of C. alternata Say. Head strongly and bluntly cari- 

 nate above, the carina produced posteriorly on the base of the vertex; face moderately 

 convex, a little peaked above in front of the blunt carina, aiarked with a line of punctures 

 each side, a little hollowed beneath the eyes, and with a few shallow punctures there as 

 well as towards the front; clypeus depressed, covered with long coar-c, white bristles. 

 Pronotum subcordate, wider than long, convex, obsoletely and minutely rastrated, with 

 the transverse bands bounded in part by scratched lines, the black bands slender, bent 

 anteriorly, about thirteen in number, the lateial margin and anterior angles broadly 

 yellow, the middle behind the produced occiput marked with a short carina, the apex of 

 posterior margin obliquely curved. Palae of female moderately slender, long, cultrate, 

 strongly curved, subacute, with long bristles, the trochanter stout and moderately long, 

 the coxae long, stout, compressed inwardly and growing wider towards the base. Clavus 



