136 EUMEJNTD^. 



second segment of the abdomen has a larger spot at the sides, and 

 no red band on the apical margin. 



Hab. Kauai. 



This species is not rare on Kauai. 



Group of Odynerus totonacus, Saussures American Wasps, p. 346. 



4. Odynerus montanus. 



Female. Length 6 lines. — Entirely black and shining ; wings deep 

 brown-black, with a violet iridescence, very brilliant ; the stigma 

 and costal nervures bright steel-blue. The clypeus convex, finely 

 punctured, with the apex truncate. Thorax not so strongly or 

 closely punctured as the head ; the scutellum flat, the postseutellum 

 slightly convex, shining, and sparingly punctured ; the metathorax 

 concave-truncate, having a central longitudinal channel ; obliquely 

 rugulose in the middle, the sides coarsely rugose. The first seg- 

 ment of the abdomen campanulate, strongly but not very closely 

 punctured, the apical margin rebordered ; the second segment very 

 convex, elevated to a subconical shape, finely and not very closely 

 punctured ; its apical margin, as well as the following segments, 

 with larger shallow punctures. 



Male. Length 5| lines. — Closely resembling the female ; the cly- 

 peus more strongly punctured, the terminal hook of the antennas 

 rufo-piceous ; the thorax and abdomen as in the female. 



Hab. Mountains of Oahu, where it is common. 



5. Odynerus congruus. 



Female. Length 4| lines. — Black, punctured, and shining; the 

 wings fusco-hyaline, with a dark fuscous stain along the anterior 

 margin of the front pair. The head with distant fine punctures ; 

 the clypeus very convex, and with a small truncate projection at 

 its apex ; impunctate, or with only a few very fine distant punc- 

 tures. Thorax smooth and shining above, having only a few very 

 fine shallow punctures ; the scutellum slightly convex ; the meta- 

 thorax opaque, oblique, and with shallow rather large indentations, 

 the lateral margins rounded, without any excavation ; the claws 

 of the tarsi ferruginous. Abdomen with the first segment cam- 

 panulate, as long as broad, finely, evenly, but not very closely 

 punctured ; the second segment large, impunctate, or with only a 

 few very fine shallow punctures, its apical margin, as well as the 

 following segments, with shallow fine punctures. 



Male. Smaller than the female, but of the same form and similarly 

 sculptured ; differs in having at the apex of the clypeus two little 

 pale yellow lines, and also a small ovate yellow spot just above the 



