188 PROCEEDINGS OF THE ACADEMY OF [June, 



AA. Dorsum of metatarsus serrate or serrulate on margins. 

 B. Facial protuberance not markedly divided. 



(Oligacanthopus 20 n. gen.) 

 (Genotype 0. prograptus.) 



C. Tegmina of male absent or only represented by rudiments. 

 D. Internal tibial spurs elongate, slenderer, 



Microgryllus Philippi. 

 (Genotype M. paUipes.) 



DD. Internal tibial spurs less elongate, more robust, 



Mogoplistes Serville. 

 (Genotype M. brunneus.) 



CC. Tegmina of male present, although frequently hidden 

 under pronotum. 



D. Pronotum of male very elongate, equal to two- 

 thirds of body length. (Tegmina present, but 

 completely covered by pronotum.) 



Ectatoderus Guerin. 

 (Genotype E. nigriventris.) 



DD. Pronotum of male less elongate. (Tegmina partly 

 visible or [Cryptoptilum] completely hidden under 



pronotum.) 

 E. Pronotum strongly narrowing cephalad in male, 

 in length equal to about one-half that of 

 body. 

 F. Tegmina of male not visible beyond pronotum. 



General size small, Cryptoptilum n. gen. 



(Genotype C. antillarum.) 



FF. Tegmina of male with periphery visible 

 beyond pronotum. General size very small, 



Cycloptilum Scudder. 



(Genotype C. squamosum.) 



(Oligacanthopus n. gen., vide supra.) 



EE. Pronotum not strongly narrowing cephalad in 



male, in general more or less subquadrate. 



F. Tibial spurs very long. Ovipositor not at all 



enlarged at apex, Hoplosphyrum n. gen. 



(Genotype H. occidentale.) 



FF. Tibial spurs very short. Ovipositor some- 

 what enlarged at apex, ..Ornebius Guerin. 

 (Genotype 0. xanthopterins.) 

 BB. Facial protuberance markedly divided. 



C. Tegmina absent in both sexes. (No perforation of 



cephalic tibiae.) Arachnocephalus Costa. 



(Genotype A. vestitus.) 



20 This new genus belongs in this division, nearest Cycloptilum, but as it is 

 known only from the female we are unable to place it more exactly in this key. 



