[l6l] HYMENOPTERA 167 



hind orbits; the antennas, except a yellowish-white spot on joints 14 

 and 15, are wholly black; the legs are red, with the coxas slightly at 

 base, hind tibiae toward apex and their tarsi faintly, fuscous or 

 blackish ; while the abdomen is alutaceous and feebly but distinctly 

 punctate, especially on segments 2 and 3, the punctuation of the fourth 

 segment very faint, the fifth and beyond alutaceous, impunctate, 

 the petiole rugulose its entire length except a narrow transverse, 

 smooth, shining spot at the extreme apex of the middle lobe, or space 

 between the dorsal carinas. 



From Popof Island, July 6. 



This species was originally characterized by Mr. Davis from a 

 single female, taken by Professor Aldrich, at Moscow, Idaho. 



PLATYLABUS CALIFORNICUS Cresson. 



Platylabus californicus CRESSON, Proc. Acad. Nat. Sci. Phila., p. 357, 1878. 

 CRESSON, Trans. Am. Ent. Soc., vi, p. 201, 1877. CRESSON, Syn. 

 Hym. North Am., p. 191, 1887. 



Type in collection of the American Entomological Society. From 

 Kukak Bay, July 4. One female. 



Tribe PH^&OGENINI. 



Genus Centeterus Wesmael. 



CENTETERUS DORSATOR sp. nov. 



Male. Length 6 mm. Head, except face, upper orbits and a spot 

 back of the ocelli, the antennas, prosternum, mesosternum, anterior 

 margin of the mesopleura, metathorax entirely, sutures of thorax 

 above, petiole of abdomen, except at apex, and the middle and hind 

 coxas beneath, black ; the lines on front orbits and the spot back of 

 ocelli lemon-yellow ; rest of body ferruginous, except that the first 

 joint of the middle and hind trochanters, tips of hind tibiaa and their tarsi, 

 and lateral blotches on dorsal abdominal segments 2 to 4 are fuscous. 



The head is subquadrate, the temples broad, apparently smooth and 

 impunctate, although with a strong lens the frontal depression is seen 

 to be alutaceous. The thorax is smooth and shining, but with some 

 sparse, minute punctures scattered over its surface, the metathorax being 

 finely rugulose, the areola quadrate, open towards the base, the basal 

 lateral and middle lateral areas confluent. The abdomen is longer 

 than the head and thorax united, smooth and impunctate, except that 

 the petiole and the second segment under a strong lens, are seen to 

 have a very fine, coriaceous sculpture. 



