62 PROCEEDINGS OP THE AMERICAN ACADEMY. 



17. Ceuthophilus arizonexsis, sp. nov. 



Pallid luteous, so heavily infuscated that behind the pronotum there 

 is only left a single series of luteous spots on each side, which on the 

 meso- and metanotum are transverse oval and rather large, and on 

 the abdomen are transverse anterior stripes, sometimes confluent with 

 those of the opposite side ; the pronotum is mostly fuscous, deepest 

 around the margin, more or less dotted and vermiculate with luteous 

 elsewhere, there being commonly a transverse row of dots bordering 

 the anterior fuscous margin, and the disk on either side more or less 

 heavily blotched with the same ; the legs are fuscous, varying in depth 

 in different individuals, the hind femora generally with sufficiently 

 conspicuous scalariform markings. The antennae are very slender and 

 fully three times as long as the body, and the legs are slender but not 

 very long. Fore femora slightly stouter than the middle femora, a 

 third longer than the pronotum and half as long as the hind femora, 

 the inner carina with one or two spines. Middle femora with 1-3 

 spines on the front carina, and the hind carina generally unarmed 

 except for a slight genicular spine, but sometimes with as many as 

 three other minute spines. Hind femora nearly as long as the body, 

 twice the length of the fore femora, moderately slender, being a little 

 less than three and a half times longer than broad, gradually diminish- 

 ing in size and yet with the distal fourth subequal, the surface with no 

 raised points, the outer carina with only a few raised points, mostly on 

 the distal half, the inner carina with most minute but sharp distant 

 spinules, the intervening sulcus narrow. Hind tibiag scarcely longer 

 than the femora, straight in both sexes, very slender, armed beneath 

 with a single preapical spine besides the apical pair ; spurs nearly 

 opposite, the basal beyond the end of the proximal third of the tibia, 

 about as long as the tibial depth, set at an angle of from 35-40° with 

 the tibia and generally divaricating about 70-80° (one example about 

 100°), their tips incurved ; inner middle calcaria a little longer than 

 the outer, fully twice as long as the others or as the spurs, but much 

 shorter than the first tarsal joint. Hind tarsi less than half as long 

 as the tibijE, the first joint fully as long as the rest combined, the 

 second twice as long as the third and with it as long as the fourth. 

 Cerci stout on the proximal, slender on the distal half, nearly as long 

 as the femoral breadth. Ovipositor four fifths the length of the hind 

 femora, slender, nearly straight, tapering slightly, the tip finely pointed 

 at an angle of about 30° and barely upturned, the armature of the 

 inner valves aculeate, only the terminal arcuate. 



