224 NORTH AMERICAN SCELIPHRON (hYMENOPTERA) 



Chalyhion texanum Patton, idem. 

 Chalybion aztecum Patton, idem. 

 Chalyhion zimmermanni Cameron, Biol. Centr.-Amer., pt. 71, 188S, Hym., ii, 



25. 

 Chalyhion aztecum Cameron, idem. 



Types. — Dahlbom evidently described zimmermanni from at 

 least two specimens, since he records both male and female. In 

 the Berlin Museum there is a specimen labelled with this name, 

 but so far as could be ascertained by Fernald, who examined it 

 in 1913, the only difference from cyaneum was that the dorsum 

 of the propodeum was slightly cross striate which, as has been 

 shown, is not distinctive. At Lund there are several specimens, 

 the first a male being labelled "Zimmerm N. Amerika" on the 

 upper label and "Zimmermanni Dlbm. sp. ign." on the second. 

 On the dorsum of the propodeum of this specimen are traces of 

 transverse ridges, the thoracic hairs are white and wings quite 

 fuliginous. Another specimen is labelled "E. Sud Carolina a 

 Zimmermann." The writer is inclined to regard the first named 

 specimen from Lund as representing at least one of the original 

 specimens used by Dahll^om and the one at Berlin as not zimmer- 

 manni at all. 



The types of aztecus Saussure have not been seen, but are prob- 

 ably in the Saussure collection at Geneva. 



Texanus Cresson was described from two specimens called 

 female and male. No females with clear wings are known and a 

 reexamination of material at Philadelphia by Mr. Cresson shows 

 that he designated one of them as female by error. Two speci- 

 mens of this species labelled " type " in the United States Museum 

 are in reality paratypes. 



This species has been redescribed from seven females and 

 fourteen males from the localities mentioned in the habitat. 



Female. — Medium .sized, dark lilue or blue green, coarser pilosity ever\"\vhere 

 dark except on dorsum of median segment wliere it is whitish, finer hair.s silvery 

 to whitish; no j)ubescent s]:>ots on third and fourth ventral segments of abdo- 

 men; mandibles unidentate; wings fuliginous. 



Head similar to that of cyaneum in general shape; clypcus usuall}' somewhat 

 flat at sides, arched in center, with median ridge, surface distinctly punctured, 

 pilosity only moderately dense, silvery pubescence on sides, anterior margin 

 l)lack with narrow extensions under the eyes, three rather pointed teeth, no 

 lateral processes, posterior margin l)roadly truncate and slightly emarginate; 



