CYDNIDAE OF THE WESTERN HEMISPHERE FROESCHNER 407 



Diagnosis.— Among the cydnid genera occurring in the Western 

 Hemisphere, this one may be recognized by being large (more than 

 nine miUimeters in length of body), black, and having the membranal 

 suture very strongly bisinuate (fig. 4). 



Description. — Size large, shape elongate-oval, sides subparallel; 

 dorsum weakly convex, venter strongly so. 



Head: Length more than three-fourths width; margins broadly 

 expanded, eyes faintly or not at all projecting; iuga greatly surpassmg 

 clypeus, broadly contiguous beyond it and very strongly elevated 

 anteriorly; submarginal row of setigerous punctures on each jugum far 

 removed from margin; clypeus with two subapical setigerous punc- 

 tures; ocelli small, behind a line connecting posterior margins of eyes 

 and separated from eyes by a space about two or more times a 

 transverse ocellar width; juga ventrally roughened by weak rugae 

 and weaker punctures; maxillary plate with irregularly spaced, fine 

 tubercles; antennae 5-segmented, I shortest, II and IV subequal, 

 longer than III or V; bucculae (fig. 21) very high, posterior end 

 highest and abruptly, perpendicularly truncated; labium reaching 

 onto mesosternum, I shortest, II and III usually subequal, longer 

 than IV. 



Pronotum: Length a little more than half of width; anterior margin 

 weakly emarginate; lateral margins carinate, weakly converging 

 from base to apical third, thence broadly rounded to anterior angles; 

 posterior margin nearly straight across width of scutellum, then 

 depressed and slightly lobulate before curving obliquely forward 

 laterally; all angles rounded; transverse impression submedian, broad 

 and shallow; anterior lobe of male strongly inflated across middle 

 three-fifths of posterior third, thence abruptly declivitous to anterior 

 margin; anterior lobe of female without such elevation; posterior 

 lobe in both sexes only slightly convex. 



Scutellum: A broad, short, triangle, base and side margins subequal 

 in length; sides strongly and abruptly declivitous, virtually per- 

 pendicular on basal half or more; apex narrowed, acute. 



Hemelytron: Corial area, except costa, wtII defined; membranal 

 suture distinctly bisinuate, sinuation accentuated by black basal 

 margin of milky membrane; membrane longer than basal width, 

 surpassing apex of abdomen. 



Propleuron: Convexities and depression with numerous close-set 

 small tubercles and some closely associated punctures; prosternal 

 carinae low, thick, obscured by heavy punctation; anterior margin 

 very weakly expanded either side of middle. 



Mesopleuron: Surface irregular, strongly impressed laterally; 

 evaporatorium limited; lateral area coarsely rugopunctate; meso- 



