THE CANADIAN ENTOMOLOGIST. 



.)4/ 



Anterior and intermediate tarsi short, nut longer than their tibiae, 

 the joints 2-4 very short, wider than long, and lobed ; the 

 pulvilli very large ; posterior face of metathorax not deeply 

 impressed, the lateral angles not sharp, rounded and without a 

 deep emargination ; last joint of antennae in .^ slightly bent, 

 truncate at apex, the antepenultimate and penultimate joints 

 normal Megastizus, Patton. 



Anterior and intermediate tarsi always distinctly longer than their 

 tibije, the joints 2-4 short, but, except sometimes the fourth, not 

 lobed ; posterior face of metathorax deeply impressed, the 

 lateral angles or ridges sharp, and with a deep emargination ; 

 second cubital cell triangular, always narrowed to a point or 

 nearly above, and often petiolate ; last two joints of antennte in 

 ^ curved, the last pointed or ending in a slight spine, the 

 antepenultimate joint beneath at apex, ending in a small 



s]Mne Stizus, Latreille. 



= Bembecinus, Costa. 

 = Stizomorpha, Costa. 

 North American Species. 



(i) ExEiRus, Shuckard. 



(2) KoHLiA, Handlirsch. 



(3) Sphecius, Dahlbom. 



(i) S. speciosus, Drury, $ $. 



(2) S. corvallis, Patt., 9 ^ . 



(3) S. Hogardii, Latr., ? $. 



(4) S. grandis, Say, ? ^ . 



(5) S. fervidus, Cr., 5 $ . 



(6) S. nevadensis, Cr., 9 • 



(7) S. raptor, Handl. 



(4) Ammatomus, Costa. 



(i) A. moneduloides, P„ack. 

 (Gorytes) 9 <?  



(5) Handlirschia, Kohl. 



(6) Stizoides, Guerin. 



(7) Megastizus, Patton. 



(i) M. brevipennis, Walsh, 9 ^ 

 (2) M. texanus, Cr., 9 6  



(8) Stizus, Latreille. 



(i) S. Godmani, Cam. 



(2) S. nanus, Handl. 



(3) S. flavus, Cam. 



var. subalpinus, Ckll. 



(4) S. Servillei, Lepel. 



(5) S. xanthochrous, Handl. 



(6) S. moneduloides, Cr., 9 ^ . 

 (j) S. neglectus, Smith, ^. 



(S) S. lineatus, Cr., ^ . 



(i) S. unicincta, Say, ^ ^ . 



Family XXV.— Sphegidte. 

 This family is readily distinguished from all of the previously 



