238 THE CANADIAN ENTOMOLOGIST. 



OPHIGOMPHUS. 



Explanations of Plate 5. 



Figs. I and 28 — O. Carolus, Ndhm. 



Figs. 10, 19 and 36— O. Mainensis, Pack. 



Figs. 2, II, 20 and 29 — O. aspersus, Morse. 



Figs 3, 12, 2[, ^^o ind 3[ — O. rupinsulensi'^, Walsh. 



Figs. 4, 13 and 22 — O. occidentis, Hag. 



Figs. 5, 14 and 23 — O. iMorrisoni, Sel. 



Fig. 32 — O. bison, Sel. 



Figs 6, 15, 24 and 33 — O. severus, Ha,2;. 



Figs. 7, 16, 25 and 34 — O. colubrinus, Sfl. 



Figs. 8, [7, 26 and 35 — O. Carolinus, Hag. 



Figs 9, i8 and 27 — O. Johannus, Ndhm. 



The figures in the first column represent lateral views of the terminal 

 abdominal appendages of the males ; those in the second column, 

 dorsal views of the same ; those in the third column, the genital hamules 

 of the males, inverted and viewed from the side ; those in the fourth 

 column, vulvar lamina of females upon the sternum of the 9th abdominal 

 segment: — excepting ^g?>. 10, front, and 19, oblique fronto-lateral views 

 of the occipital process of the female type of O. Mainensis ; fig. 26, 

 ventral view of male abdominal appendages ; and fig. 31, dorsal view of 

 the head of O. rupinsulensis, showing the curious post-ocular tubercles : 

 e, eye ; _/, frons. 



CLASSIFICATION OF THE ENTOMOPHILOUS WASPS, OR 

 THE SUPERFAMH^Y SPHEGOIDEA. 



BY WILLIAM H. ASHMEAD, ASSISTANT CURATOR, DIVISION OF INSECTS, 



U. S. NATIONAL MUSEUM. 



(Paper No. 4.) 

 Family XVIH. — Bembicid^. 



The sessile abdomen, always without a constriction between the 

 first and second segments, but above all the very large, free, triangularly 

 elongated labrum, which is always much longer than wide at base, the 

 sinuate or cr'-shaped transverse median nervure in the hind wings, an^ the 

 aborted ocelli, at once distinguished the family. 



Most authorities have confused, or at least included this family with 

 the family Stizida?, which also has a more or less prominent labrum ; but 

 in the Stizidse the ocelli are always distinct, normal, the labrum is most 



