42 Cameron, Hymenoptera Oricntalia. 



the fourth segment broadly yellow, a narrow, short, rufous 

 line down the middle at the base, and a rufous mark on 

 each side; the fifth segment broadly yellow, in the middle; 

 the rufous triangularly projecting into it at the sides and 

 at the base in the middle ; the last segment broadly 

 yellow ; there is a transverse depression at the apex. The 

 sides, base and apex of the lower side of the petiole 

 smooth, impunctate, the rest with stout, slightly curved 

 keels. The second segment, except in the middle, with 

 shallow, rather widely separated, punctures ; the other 

 segments much more closely and strongly punctured. 



What is no doubt a variety has the apex of the second 

 abdominal segment broadly lemon-yellow, while in its 

 centre, at the base, is a large, somewhat triangular, black 

 mark, the narrow part of which is at the base; its fourth 

 segment is black at the base. 



Note. — This species may not be a true Pterochilus. The 

 maxillary palpi are 6-jointed as in the typical species ; but the 

 labial are distinctly 4-jointed, whereas in Pterochilus proper they 

 are 3-jointed only. On the basal joint of the labial palpi there are 

 two or three hairs near the middle; and at the apices of the first, 

 second, and third joints are two or three long, stiff, bristle-like 

 hairs. The fourth joint is bare and is nearly half the length of the 

 third. In addition to the four large apical teeth on the man- 

 dibles, there are two small ones and a much larger rounded one. 



The number of joints in the labial palpi and their clothing 

 do not appear to be features of generic importance. Saussure 

 says {Monog. des Guepes, iii., p. 321) : " On remarque des especes 

 dont les palpes labiaux sont a peine comprimes et a peine 

 plumeux ; on apergoit meme parfois un quatrieme article rudi- 

 mentaire ;" but in oar species the fourth joint cannot be called 

 " rudimentary," being quite distinct. 



ODYNERUS. 



Odynerus EREBODES, Sp. nov. 

 Niger ^ capite thoraceque distincte pu?ictatis ; abdominis 

 seg7nentis i-j pallida flavo-balteatis ; pedibus sordide rufis; 



