THE CANADIAN ENTOMOLOGIST. 



ORCHELIMUM, SERV. 



BY JEROME m'nEII.L, STANFORD UNIVERSITY, CALIFORNIA. 



This genus of Orthoptera is confined almost entirely to North 

 America, where it is represented by twenty or more si)ecies. Joseph 

 Redtenbocher in his " Monographie der Conocephaliden," published in 

 1891, united Orchelimuvi, Serv., to Xiphidiuni, Serv. This action seems 

 scarcely justified, as the two groups are quite as distinct as many other 

 Orthopteran genera, and Redtenbocher's authority has not been generally 

 recognized in this country. The species are distinguished with difficulty 

 and the descriptions are widely scattered. These considerations have led 

 me to attempt to make a key for their identification. It is quite possible 

 that some of the species indicated are synonymous, but I am inclined to 

 believe that all I have recognized are good, and I believe tliere are a 

 considerable number undescribed. Many forms which differ from each 

 other by very few structural differences are distinguished by some 

 peculiarity of song or habit or habitat, and it is certain that a considerable 

 number of them have been overlooked. 



Key to Orchelimum. 



A. Hind femora not armed with small spines on the under side. 



b^ Ovipositor straight or very slightly curved ; face not striped 

 medianly, pale. 



c'. Tegmina surpassing the tips of the femora more or less. 



Length of the ovipositor 10 mm. or more, little if any less 



than two-thirds the length of the hind femora. 



d^ Pronotum short, less than one-fourth the length of the 



body and not more than 4 mm. long ; tegmina only 



slightly surpassing the tips of the hind femora ; a broad 



reddish-brown band upon the head and pronotum, 



somewhat paler in the middle Delicatuni, Bruner. 



d^. Pronotum longer, more than one-fourth the length of 

 the body and more than 4 mm. long ; tegmina little if 

 any shorter than the wings and reaching almost to the 

 tip of the ovipositor ; two well-defined narrow dark 

 brown diverging lines upon the prono- 

 tum Gladiator, Bruner. 



c^ Tegmina not reaching the tips of the hind femora ; ovipositor 

 brown, much less than 10 mm. long Minor, Bruner. 



