No.B.] PATTON ON ACULEATE HYMENOPTERA, 361 



stripe on anterior femora witliiu are black f a spot on posterior coxje 

 above, tlie four' anterior femora beneath, and the four anterior tibiie in 

 front are yellow; the ventral segments are tinged with fen>uginoiis, and 

 segments two to five have a large yellow spot on each side beneath. 

 The mandibles have a blunt tooth beyond the middle and a smaller 

 tooth before the middle ; the anterior margin of the clypeus is armed 

 with five teeth, the exterior teeth smallest; the apical ventral segment 

 is apparently emarginate at the tij). 



In C. nigrescens Smith, the mandibles have two small and sharp teeth, 

 both before the middle; the anterior margin of the clypeus is armed 

 with four teeth, the median teeth placed on a loM^er plane than the 

 others; the apical ventral segment is deeply lobed at tip; aud the 

 clypeus is armed with a quadrate process arising from its base. 



26. Cekceris SEXTASay, $. 



In one large specimen there are no black markings upon the femora. 

 In a small specimen, the flagellum, excepting basal joint, is black, the 

 legs are pale yellow, with the coxoe and four anterior troclianters more 

 or less black ; the four anterior femora behind, a broad ring near tip of 

 posterior femora, and an external and internal striiie on jiosterior tibife 

 are black; the tips of posterior femora, their tibise above, aud the basal 

 joint of their tarsi are honey-yellow, and the apical joints of posterior 

 tarsi above are fuscous. 



The clypeus of this species has three short blunt teeth at the apex, 

 the central tooth broader than the others ; the mandibles are slightly 

 sinuate on the inner margin, and slightly angulated exteriorly. The 

 terminal joint of the antenna is curved, and, like the preceding joints, 

 ridged and excavated within with sensitive pits. 



BEMBECID^. 



Stizini. 



27. Stizus ttnicinctus Say, 9 . 



One of the specimens is peculiar for having on the disk of the labrum 



a depression in the form of a large oval pit ; probably the result of an 



injury. 



Bejebecini. 



28. Monedula speciosa Cress., <? 9 . 



Syn. Monedula formosa Cress. 



The 9 specimens have a spot on the scape of the antennje above, the 

 bases of the coxte and trochanters, and a line on coxa? and femora above, 

 black. The spot about the ocelli is not connected with the yellow of the 

 face, and the spots on the venter are connected on the second segment 

 only. 



The ^ differs greatly from the 9 . The face is narrower, the apical 

 joint of the four anterior tarsi is dilated and flattened, the three preced- 



