^0.3.1 PATTON ON ACULEATE HYMENOPTERA. 355 



transversely rugose, and tlie abdomen distinctly punctured. The median 

 portion of the clypeus, in the male, is produced, its margin rounded, 

 not dentate ; the mandibles are not dentate within, or have two or three 

 minute notches. The margins of several segments of the abdomen have 

 a silvery reflection at the sides. 



18. TACHYTES CiELEBS n. sp., (? . 



Lengtli 10.5"'". Black ; the head, thorax, legs, and base of the abdo- 

 men clothed with white or silvery pubescence, particularly brilliant on 

 the face. A slight pit behind the ocelli, from which an impressed line 

 extends upon the vertex ; median portion of the clypeus produced, the 

 process glabrous, margined with an impressed line, the apex broadly 

 truncate, a slight notch at the base of the process on each side ; labrum 

 concealed, its tip transverse and entire, as in abdominalls 9, where the 

 tip is exposed ; mandibles bidentate within, the distal tooth the smaller ; 

 third and fourth joints of the antennte narrowed at the base and Avid- 

 ened at the apex, the eleventh and several preceding joints dilated 

 posteriorly, the twelfth and thirteenth joints not at all dilated. Thorax 

 and abdomen microscopically punctured; metathorax subtruncate, a 

 small pit at the apex above the truncation, and an elongated depression 

 beneath the truncation. Apical joints of the tarsi ferruginous. Wings 

 hyaline, the teguhie and nervures honey-yellow. Two basal segments of 

 the abdomen red; margins of the four basal segments silvery; apical 

 segment with no enclosure, silvery. Venter with scattered punctures ; 

 the eighth segment slightly narrowed towards the broadly sinuate apex. 



This is probably the $ of abdominaUs Say, although Mr. Cresson has 

 suggested that his T. rufo-fasciata may occupy that x)osition. 



Philanthin^. 



19. Philanthus ventilabeis Fabr. var. frontalis Cress., S . 



Sjm. PhUantlms frontalis Cress. 



This specimen has no yellow spot on the mandibles, and there are two 

 or three black dots in a line, just above the antennae, separating the 

 frontal spot from the yellow face. 



20. Philanthijs inversus n. sp., 5 . 



Length 12™"". Pale greenish-yellow; head, thorax, and first segment 

 of the abdomen with a loose white pubescence ; face finely punctured^ 

 vertex more coarsely and confluently pujictured ; thorax densely punc- 

 tured, the punctures on disk of mesothorax and scutellimi less numerous, 

 sides of the enclosure of metathorax imx)unctured and polished; abdo- 

 men coarsely punctured, the imnctures less numerous towards the apex 

 and beneath. ]^[arrow anterior borders of the clypeus and the lateral 

 borders of the upper lobe, spot on disk of clypeus, spot on each side of 

 the face lower than the antennae, a zigzag line above the antenna? con- 

 nected with their base, and in one specimen connected also with the 



