31 



Mentum moderate, subquadrate, or transversely oblong, sometimes dilated at the 

 base. 



Labium oblong, sometimes very short, generally furnished with paraglossae at its 

 anterior extremity. In Sacium and Arthrolips the labium is long and narrow, 

 strengthened at the sides by strong and apparently articulated costae. 



Lingua, in many genera, large and very broad, usually more or less emarginate in 

 front. 



Proriotum with its anterior margin generally entire, and circularly or ovally 

 rounded ; but in some genera excised to receive the head. 



Scutelluin generally small, rounded or subtriangular ; subscutellum very large and 

 broad. 



Elytra variable in form, generally rounded at the extremities, sometimes entire. 



Wings ample, narrow and strongly nerved at the basal third of their length, and 

 from thence expanded into a broad oval membrane, in which the neuration is 

 inconspicuous ; hinder margin fringed with short setae. In Corijlophodes the 

 basal portion is furnished on its hinder margin with a long oval winglet. 



Abdomen composed of apparently seven segments, of which the two apical are 

 corneous, and the rest membranaceous. 



Prothorax generally very small, with the prosternum very short, often elevated 

 between the coxse ; cpisterna minute, often inconspicuous ; epimera moderate, 

 generally enclosing the coxal cavities ; coxal cavities oval or elongate, not con- 

 tingent. In Corylnphus and Corulophodcs the coxal cavities are open on both 

 sides. 



Pectus with the mesostcrnum generally short; cpisterna large; epimera numevous 

 and narrow, not reaching the coxal cavities in unj genus except Microum and 

 Ectinuccphalus ; coxal cavities rounded and moderately distant. 



Metasternum often very large, not extending to the sides of the body, with its 

 hinder margin straight between the coxje ; epistema very long and large, 

 sometimes reaching to the hinder coxae ; epimera long and narrow, generally 

 concealed by the epipleural fold of the elytra, sometimes with their extremities 

 inflexed beyond the episterna. Posterior coxae always remote. 



Venter composed of six segments, the basal segment is nearly equal in length to 

 one half of the venter, the other segments are generally equal to each other, 

 the apical being simple. 



Legs, anterior, with the cox(e generally oval, sometimes elongate and narrow, more 

 or less free or prominent ; trochanters small, trigonal ; femora simple, often 

 robust ; tibite generally simple, sometimes dilated near the middle, in Orthopcrus 

 elongate and incurved, and bluntly hooked at the apex, with the tarsi articu- 

 lated above the extremity of the tibia ; tarsi four -jointed, one generally long 

 and simple, two rather shorter than one, generally much jjroduced and deeply 

 bifid at the lower side of its apical extremity, three usuallj' very minute, four 

 slender and long, thickened towards its extremity ; claics generally slender and 

 faintly curved, sometimes with an obtuse denticuiation on the under side of the 

 base. 



intermediate and jjosteiior very similar to the anterior, but much longer. 



Coxa, anterior, nearly contingent, more or less prominent. 

 intermediate moderately distant. 

 posterior always remote. 



Some additional observations seem to be needed with regard to the mandibles, 

 since it is diiScult to express by delineation the correct form of these organs in 

 many genera of Corylophidce. 



In the Saciina and in some others the stipes is long and flat, placed at the side 

 of the head, and connected at its extremity with the mandible by an almost straight 

 transverse suture. The mandible itself is short and broad, very convex on the 

 outer side, and on the inner side deeply concave, in the form of a sjjoon or scoop. 



