393 



miile collected at Corvallis, Oregon, June 30, probably 1907 

 or 8 (J. C. Bridwell). 



This has since remained in my collection nnidentified. 

 the peculiar structure of the mandibles having l)cen un- 

 described. The mandibles are rather elongate and slender 

 and l)identate at apex, the lower tooth being much longer 

 than the upper. When the mandibles are closed, doul)tless 

 the huge median tooth is concealed. This is sub-triangular, 

 a little recurved, acute at apex, and a little longer than its 

 distance from the upper (or inner) apical tooth. 



In Myrmosa unicolor the mandible is tridentate at the apex 

 and the inner l)road triangular tooth is much nearer the apex 

 of the mandible. 



31. Odyxerus pseudochromus Perkins. 



Occasionally this species has the angles of the propo- 

 deum reddish and a large round spot on either side of the 

 second tergite. 



The male varies also with clypeus with an cucircling 

 yellow margin as well as the red spots on the second tergite. 

 Either of these variations may exist independent of the other. 



Pseudoclironius may be distinguished from leiodevuis l>y 

 the smooth lateral area on the dorsal face of the propodeum. 

 This species employs the pupal chauibers of Anobiid beetles 

 from which the beetles have emerged as well as the pith 

 cavities of the twigs. In either ease the cavity containing the 

 cells is closed by a mud plug at the entrance some distnnce 

 away from the last cell. Two or three cells fill the Anobiid 

 pupal chamber while I have seen nests of a dozen cells iu ])ith 

 cavities. 



32. Two New Nearctic Species of HYPo^riscopuus 

 CocKERELL rRo:\r TTTE Pacific Coast, 



Hypomiseopluis Cockerell and ^fiscophinv,'< Ashmead are 

 syuonymous and were published ujion the same day. Prof. 



