NORTH AMERICAN HYMENOPTERA. 239 



golden and brassy reflections with the median space on mesothorax ante- 

 riorly black in the middle. An extreme variety from Texas is deep blue 

 with very little sreen. Basin of face in some specimens narrowly striated 

 or smooth, in others broadly striated. In pulcherima the appressed 

 white pubescence on each side of the face is not a constant character, as 

 specimens have to a less degree, and in some it is wanting altogether. 

 Pits small or moderate, distinct or confluent, rounded or oblong, contained 

 in a distinct, sometimes shallow groove, ending midway on the lateral 

 margin. In one specimen the pits are entirely confluent, forming a 

 broad, deep sulcus upon the surface ; 7-10 mm. 



This is the most variable species belonging to the genus Chri/sis with 

 which I am acquainted, but the variations are not fairly correlated and 

 are gradational, and therefore cannot properly separate the forms. 



G. — Apical margin of the abdomen sexdentaie. 

 Abdomen olosely (often densely) punctured on the dorsum, the punctures some- 

 times a little more separated on the sides. 

 Lateral margins of third segment strongly arched outwardly towards the base 



and sinuate just before the outer teeth fexniia. 



Lateral margins of third segment broadly sinuate or arched inwardly: pits con- 

 tained in a deep groove, caused by the swelling of the posterior margin of 



the anterior area Clara. 



Lateral margins slightly bisinuate, straight or bowed outwardly, the pits con- 

 tained in a moderately shallow groove, the margin of area not swelled. 

 The larger separated punctures on the sides of the first and second abdominal 

 segments with the intermediate spaces mostly smooth, perhaps u very few 



smaller punctures here and there iilti'icata. 



The larger separated punctures on the sides of the first and second ^"gments 

 with the intermediate spaces rather closely beset with finer punctuies. 



sexdeiitata. 

 Abdomen with the dorsal punctures sparse, well separated. 



Punctures on the third abdominal segment nearly equal over the entire surface. 



peiinsylvaiiica. 



Punctures on the middle of the posterior portion of the anterior area of third 



segment, just above the pits, very small and dense as compared with the 



rest »«iiiaragdula. 



Chrysis texaiia Gribodo, Ann. Mus. Genov. xiv, .329, 1879. 

 Four examples from Texas. Following are most of the essential 

 points from Gribodo's description, it being too long to give verbatim : 



Green, not very bright; head and thorax very closely, abdomen more sparsely 

 punctured, all the punctures of moderate size, but the first segment of abdomen 

 more heavily punctured : abdomen scarcely longer than the head and thorax 

 taken together, perfectly cylindrical, apex as broad as base; anal margin sexden- 

 tate, teeth robust, triangular, somewhat equal ; emarginations quite variable in 

 form in different specimens, but always nearly equal in size; wings subhyaline, 

 infumated. 



