THE CANADIAN ENTOMOLOGIST. 



173 



Antennae with the second joint normal, some of 

 the flagellar joints emarginate be- 

 neath Xestocrabro, Ashm., n. g. 



[Type C. 6-maculatus, Say.] 



Middle tibi;i2 with an apical spur ; antennge with the sixth 



joint strongly emarginate beneath ; abdomen sparsely 



but distinctly punctate Xylocrabro, Ashm., n. g. 



[Type C. stirpicola, Pack.] 



1 6. Antennal joints 3 and 6 emarginate, the third about as long as 4-5 



united; middle tibial spur distinct; abdomen finely, minutely, but 



distinctly punctate Protothyreopus, Ashm., n. g. 



[Type C. rufifemur, Pack.] 



17. Abdomen distinctly punctate, the pygidium without a median 



sulcus Thyreocerus, Costa. 



[Type C. crassicornis, Cosla.] 

 North American Species. 

 Subfamily III. — Crabroninje. 



(5) SoLENius, Lepeletier. 

 (i) S. cinctellus, Fox, 5. 

 (2) S. interruptus, Lepel., ?. 

 (3)S. bellus, Cr., ? S- 

 (4) S. prcducticollis, Pack. 



(5) S. rufipes, Lep. 



= excavatus. Fox. 



(6) S. scaber, Lepel. 



(7) S. texanus, Cr. 



? S. ventralis. Cam. 



(6) Thyreus, Lepel. 



(7) EcTEMNius, Dahlbom. 



E. montanus, Cr. 



E. atriceps, Cr. 



E. brunneipes, Pack. 

 E. corrugatus, Pack. 



E. parvulus, Pack. 



E. pauper. Pack. 



(8) Crabro, Fabricius. 



(i) C. maculatus, Fabr. 

 singiilaris, Sm. 



quadrangular is, Pk. 



i8-tuaculatus, Pk. 

 (2) C. trapezoideus. Pack, 

 uncertain position. 

 C. saxatilis, Cam. 

 C. Championi, Cam. 

 C. antiplanse, Cam. 

 C. sonorensis, Cam. 

 C. montivagus, Cam. 

 C. centralis, Cam. 

 C. ariel, Cam. 

 C. vestor, Cam. 

 C. costariensis, Cam. - 

 C. guerrerensis, Cam. 

 C. yucatensis, Cam. 

 C. montezuma, Cam. 

 (9) HvpocRABRO, Ashm. 



H.decemmaculatus,Say, $ rT 

 H. Packardii, Cr., $ . 

 (10) PsEUDOCRABRO, Ashm. 



(i) P. odyneroides, Cr., ? S. 



