Oct., '08] ENTOMOLOGICAL NEWS. 373 



Colorado Bembicidae. 

 BY S. A. JOHNSON AND S. A. ROHWER. 



The main object of this paper is to give the distribution, 

 within the State, of the species which are known to occur 

 here, and to add a few species which have hitherto not been 

 reported. The notes are based principally on the collection 

 of the Colorado Agricultural College, but a few species have 

 been taken by the junior author. 



To make the paper more complete, tables to separate the 

 genera and species are offered. 



The family may be separated into two distinct subfamilies 

 as follows : 



Middle tibiae with two spurs at apex ; ocelli normal, round. . . STJZIN^E. 



Middle tibiae with one spur at apex ; ocelli more or less abnormal, espe- 



cially the anterior one 



STIZIN.E. 

 Marginal cell much longer than the first cubital ; species large. 



Sphecius Dahlb. 



Marginal cell much shorter than the first cubital ; both large and small 

 species .................... Stizus Latr. 



SPHECIUS Dahlb. 



This is a small genus, containing but four species in the 

 United States. These are all southern forms. There is but 

 one species known from Colorado, 6". spetiosus Drury. We 

 have two females and a male from L/as Animas, Col., August 

 17, 1901. The thorax is rufous. 



STIZUS Latr. 



Species large ; metathorax not emarginate posteriorly (Megastizits). . i. 



Species smaller, about 10 mm. ; metathorax emarginate posteriorly 



(Stizus} ......................... 2. 



1. Wings mostly blue-black ; first and second transverse cubiti meeting, 



or nearly so, on the radial ; second dorsal abdominal segment 

 with a rufous band, other segments black. . . unicinctus Say. 

 Wings hyaline ; first and second transverse cubiti distinctly separated 

 on radial ; abdomen with many pale spots or bands. 



brevipeimis Walsh. 



2. Black, with pale markings .............. godmani Cam 



Yellow, with a few black markings ......... subalpinus Ckll. 



