CYDNIDAE OF THE WESTERN HEMISPHERE — FROESCHNER 367 



shaped posterior tibiae offer the most readily available means of 

 identification. 



Description.- — Short, compact, strongly convex dorsally and 

 ventrally; widest posterior to midlength of body. 



Head (figs. 20, 51): Little wider than long, anterior two-thu-ds 

 strongly declivent; margin of jiigum crenulate with a series of oblique, 

 overlapping crenulations with a single cilium between, without a 

 submarginal row of spines or cilia; eyes prominent, strongly projecting; 

 ocelli well developed, situated behind a line connecting posterior 

 margins of eyes; clypeus as long as or longer than jugum; antennae 

 4-segmented, IV thickest; bucculae vestigial or absent, maxillary 

 plate with a tuft of long cilia near their site; labium short, arising 

 posterior to apex of head, not or only slightly surpassing anterior 

 coxae, II thickest, with a large, foliaceous, semicircular lobe which is 

 often hidden between anterior coxae. 



Pronotum: Distinctly broader than long, narrowed anteriorly, all 

 angles and lateral margins broadly rounded; lateral margins carinate, 

 strongly deflexed with a submarginal row of 12 to 20 setigerous punc- 

 tures; transverse impression weak or absent; posterior lobe longer 

 than anterior lobe and with wide, transverse rugae which are some- 

 times punctured. 



ScuteUum: Longer than broad; sculptured similarly to posterior 

 lobe of pronotum; apex expanded, broadly rounded, wider than half 

 of membranal suture. 



Hemelytron: Corial areas usually well defined; membranal suture 

 distinctly sinuate on medial half; membrane hyaline to slightly milky, 

 not more than two-fifths of hemelytral length, usually distinctly sur- 

 passing apex of abdomen. 



Propleuron: Strongly convex anterior to depression, impunctate; 

 evaporatorium restricted to posterior part of segment; mesosternum 

 carinate medially, with numerous long hairs. 



Metapleuron: Slightly convex, impunctate; osteole opening pos- 

 teriorly under reduced peritreme surrounded by extensive evapora- 

 torium. 



Legs: Short and stout; anterior femora stout, thick, height about 

 one-half length, anterior tibiae strongly depressed, cultrate, prolonged 

 beyond tarsal insertion by more than one-third its length; tarsi very 

 slender, length more than half of tibia; II shortest, subequal in 

 diameter to I and III ; middle femora not much swollen ; middle tibiae 

 somewhat clavate, curved, ciliate, slight^ projecting beyond tarsal 

 insertion; length of middle tarsus about one-third of tibia; posterior 

 femora very strongly swollen, convex dorsally; posterior tibiae stoutly 



