100 PROCEEDINGS OF THE AMERICAN ACADEMY. 



straight, of the same length as the femora, stout, basally constricted, 

 beneath with a row of distant spines besides the apical pair ; spurs sub- 

 opposite, the basal pair at the end of the proximal third of the tibia, 

 scarcely longer than the tibial depth, set at an angle of 45° with the 

 tibia and divaricatina; 70-80° ; inner middle calcaria but little lonsfer 

 than the outer, about half as long again as the others or as the spurs, 

 shorter than the first joint of the tarsus. Hind tarsi about one third 

 as long as the tibiae, the first joint scarcely longer than the fourth and 

 less than twice as long as the second and third together, the sec- 

 ond but little longer than the third. Cerci rather slender, tapering 

 throughout, pointed, much shorter than the femoral breadth. Ovi- 

 positor nearly straight, scarcely longer than the fore femora, the basal 

 half tapering, the apical slender and equal, the tip pretty strongly 

 upcurved to a fine point, the teeth and especially the apical tooth very 

 long, slender, and arcuate. 



Length of body, ^ 17 mm., 9 17 mm.; pronotum, $ 6.25 mm., 

 9 5.5 mm. ; fore femora, $ 7.65 mm., 9 6.5 mm. ; hind femora and 

 hind tibiae, each, J' 16.25 mm., 9 13 mm. ; ovipositor, 7 ram. 



\ S, \ 9. Explorations of the Upper Missouri and Yellowstone 

 under Lt. Warren, F. V. Hayden. I also find in the U. S. National 

 Museum from the Riley collection 1 (?, 2 9 , from Nebraska, the 

 Platte River, Nebr. (McCarthy), and Ft. Riley, Kans. 



By the brevity of the first and second hind tarsal joints and the 

 slight enlargement of the fore tibiae in the male, this species approaches 

 the genus Phrixocnemis, but the normal development of the armature 

 of the hind tibiae forbids placing it there. 



55. Ceuthophilus neomexicanus, sp. nov. 



Dark testaceous or castaneous, glabrous, broadly but gradually 

 infuscated, especially above, on the posterior margins of all the seg- 

 ments, and on the anterior portion of the pronotum, which is otherwise 

 more or less slightly mottled, beneath and on the lower portions of the 

 sides invariably lighter and generally more nearly unicolorous. Legs 

 testaceous, the hind femora externally with a feeble median longi- 

 tudinal infuscation sometimes visible only on the distal half, where it 

 is often diffused and accompanied by feeble slender herring-bone 

 infuscations on either side, the hind tibial spines feebly infuscated at 

 apex. The antennae are not very slender and the legs short. Fore 

 femora distinctly stouter than the middle femora, but little longer than 

 the pronotum and less than half as long as the hind femora, the inner 

 carina with a subapical spine, sometimes accompanied at variable 



