84 PROCEEDINGS OF THE AMERICAN ACADEMY. 



bent spines besides the apical pair ; spurs subopposite, the basal beyond 

 the end of the proximal third of the tibia, fully as long as the tibial 

 depth, set at an angle of about 50° with the tibia and divaricating 

 about 90°, feebly incurved at tip ; inner middle calcaria considerably 

 longer than the outer, twice as long as the others and nearly twice as 

 long as the spurs, but very much shorter than the first tarsal joint. 

 Hind tarsi fully two fifths the length of the tibia, the first joint fully 

 equal to the rest together, the second twice as long as the third and 

 with it as long as the fourth. Cerci slender and regularly tapering, 

 about as long as the femoral breadth. Ovipositor of exceptional 

 length, being nearly as long as the hind femora, very feebly arcuate, 

 slender throughout but especially beyond the proximal third, the tip 

 scarcely upturned more than the uniform arcuation and produced to 

 an angle of only about 40°, the teeth of the inner valves more distant 

 than usual, aculeate but not long, arcuate. 



Length of body, S 8.5 mm., 9 18 mm. ; pronotum, ^ 3 mm., 9 5 

 mm. ; fore femora, ^ 3.5 mm., 9 6.1 mm. ; hind femora, ^ 7.5 mm., 

 9 12 mm. ; hind tibia;. S 8 mm., 9 13.5 mm. ; ovipositor, 11.25 mm. 



1 <^, 29. Hat Creek, Nebr., in wells; Pine Ridge, Nebr., Aug. 4, 

 under timber ; Hecla, Wyo. ; all from L. Bruner. The ^ from Pine 

 Ridge is rather immature. 



42. Ceuthophilus sylvestris. 



Ceuthophilus sylvestris Brun.!, Bull. Washb. Coll., i. 126-127 

 (18H5). 



Nearly uniform mahogany brown, glabrous, very faintly and 

 broadly infuscated at the hinder margins of all tlie segments and on 

 the front margin of the pronotum, the lateral margins of the thoracic 

 segments very i'aintly bordered with obscure luteous ; legs uniformly of 

 a lighter tint than the body, the hind femora without scalariform mark- 

 ings. Antennae slender, more than twice as long as the body, the legs 

 moderately short. Fore femora no stouter than the middle femora, 

 scarceh'^ longer than the pronotum, half as long as the hind femora, 

 the inner carina with a short subapical spine. Middle femora with 

 only a single small spine or occasionally a second on either carina 

 besides the posterior genicular spine. Hind femora moderately stout, 

 tapering regularly to the tip with no pregenicular constriction or genic- 

 ular enlargement, fully three times as long as broad, twice as long as 

 the fore femora, with no raised points upon the surface, both carinas 

 (9) vfith the most delicate possible uniform and not crowded serrula- 

 tion, the intervening sulcus narrow. Hind tibiae considerably longer 



