374 ENTOMOLOGICAL NEWS. [Oct., '08 



Stizus (Megastizus) unicinctus Say. 



We have not seen this species. It is recorded from Colo- 

 rado by Cresson (cat.), and Ashmead (Colo. list). 



Stizus (Megastizus) brevipennis Walsh. 



We have a male of this species from Ft. Lupton, Colorado, 

 July 22, 1900. 



Stizus (Stizus) subalpinus Ckll. 



This was described as a variety i flavus Cam., but inasmuch 

 as all the northern ones are as pale as subalpinus, it may be 

 called a species, Two males, Ft. Collins, Col,, Aug. 7, 1904. 



Stizus (Stizus) godmani Cam. 



Two males, Boulder, Col. Aug. 30, 1907, fls. of Helianthus 

 piimilis (Roh.). This species is common at L,as Cruces, New 

 Mexico. We have seen many specimens collected by C. H. 

 T. Townsend from flowers of Solidago canadensis. 



BEMBICIN^E. 



Mandibles simple ; maxillary palpi 3-jointed, labial palpi i -jointed ; spe- 

 cies about 10 mm. long Microbembex Patt. 



Mandibles armed with a tooth ; species longer than iu mm i. 



1. Metathorax emarginate posteriorly Bembiduia Jiurm. 



Metathorax not emarginate posteriorly, flat or convex 2. 



2. Anterior ocellus linear ; maxillary palpi 4-jointed, labial palpi 2-jointed. 



Bembex Fabr. 

 Anterior ocellus round or elliptic ; palpi otherwise 3. 



3. Maxilla long; reaching hind coxae ; maxillary palpi 3-jointed, labial 



palpi i-jointed ; anterior ocellus elliptic .... Steniolia Say. 

 Maxilla short ; maxillary palpi 6-jointed, labial palpi 4-jointed ; an- 

 terior ocellus round or reniform Stictia Illiger. 



MICROBEMBEX Patt. 



This genus is quite distinct. There is apparently but one 

 species known, but it has at least five distinct forms, some of 

 which may at a later time be raised to specific value. They 

 may be separated as follows : 



Clypeus and labrum mostly black i. 



Clypeus and labrum entirely yellow 2. 



i. Posterior face of metathorax with a large pale spot on each side ; a 

 large pale spot on pleura ; two pale parallel lines on middle 

 of mesonotum . monodonta occidentalis. 



