AMERICAN ORTHOPTERA. 17 



PRISTOCEUTHOPHILUS n. gen. 



Allied to Hadencecus, Ceuthophilus and Hemiudeopsylla, but pre- 

 senting quite distinctive characters. It differs from all in the pos- 

 session of but three pairs of spurs on the posterior tibia?, and in 

 having a conoid development of the vertex. From Hadencecus it is 

 separated by the elongate last palpal joint, and by the broadly 

 emarginate subgenital plate of the male. From Ceuthophilus it 

 differs in the nou spinous median coxae, and in the very long first 

 hind tarsal joint. From Hemiudeopsylla difference is noticed in 

 the absence of spines on the lower external margin of the median 

 femora, in the absence of serrations on the lower external margin 

 of the posterior femora, and in the presence of five or more small 

 spines between the larger spines on the upper margins of the poste- 

 rior tibise. 



Vertex produced into a deflected spinous process, extending 

 almost as far downward as the lower border of the eyes. Last 

 palpal joint almost twice as long as its antecedent. Anterior 

 femora without spines. Median coxa? not spined ; femora smooth, 

 except for the spine on the apex of the external portion ; tibia? 

 bearing several closely appressed spines situated around the cen- 

 tral section. Posterior femora bullate, the lower external margin 

 non serrate, carrying one (or two) small spines on the apical half; 

 tibia? bearing many (five to thirteen) small spines between the 

 larger ones; apical spurs three in number; first tarsal joint very 

 long, much longer than the remaining portion. Subgenital plate 

 broadly emarginate. 



I'ristoceuthopliiliis rlioatlsi n. sp. 



Type: male; Uruapan, Michoacan, Mexico. April 11, 1899. 

 Collected by S. N. and M. C. Rhoads. 



Size small. Hear! projecting but little beyond the pronotum. glabrous; eyes 

 subtriangular, very slightly projecting; antennae heavy, rather long; palpi long, 

 the terminal joint subarcnate. Pronotum strongly rounded transversely, very 

 slightly so longitudinally ; anterior and posterior margins truncate, lower margin 

 of the lateral portions very slightly sinuate ; median portion bearing a very faint 

 longitudinally disposed sulcus; posterior portion hearing a number of irregular 

 rugosities. Mesonotum with rugosities similar to those on the pronotum placed 

 across the posterior portion. Anterior femora slightly longer than the pronotum. 

 unarmed, strongly sulcate below; tibise slightly shorter than the femora, lower 

 surface bearing three closely appressed spines on the distal portion, apical spines 

 four in number the lower pair the larger ; first tarsal joint fully as long as the 



TRANS. AM. ENT. SOC, XXIX. (3) NOVEMBER, 1902. 



