CYDNIDAE OF THE WESTERN HEMISPHERE — FROESCHNER 509 



latter by space not as great as transverse ocellar width; antennae 5- 

 segmented, short, not reaching posterior margin of pronotum, II 

 shortest, III, IV, and V subequal, longer than I; bucculae almost as 

 high as labial II (without lobe), evanescent posteriorly; labium reach- 

 ing between middle coxae (fig. 36), II longest, strongly curved apically 

 and with large, semicircular, foliaceous lobe, this often hidden between 

 anterior coxae, IV shortest. 



Pronotum: Length more than half width; anterior margin moder- 

 ately, doubly emarginate; lateral margin straight on basal half, with 

 submarginal row of 14 to 19 setigerous punctures; transverse impres- 

 sion submedian, impressed or not, marked by row of distinct punc- 

 tures; anterior lobe subapically v.ith punctate impressed area which is 

 larger in males than females. 



Scutellum: Wider than long; width of broadly rounded apex less 

 than half the length of membranal suture. 



Hemelytron : Corial areas well-defined and, except for limited area 

 on exocorium, more or less uniformly punctate throughout; membranal 

 suture weakly concave, lateral angle noticeably produced; membrane 

 almost two-fifths hemelytral length, its length greater than basal 

 width, surpassing apex of abdomen. 



Propleuron : Finely punctate in depression ; prosternal carinae very 

 low, a thick, blunt ridge. 



Mesopleuron (fig. 110): Flat, impunctate, evaporatorium reaching 

 into posterolateral angle, attaining lateral margin of segment. 



Metapleuron (fig. 110): Flattened to slightly convex, osteolar 

 peritreme reaching half-way across segment, without terminal modi- 

 fication, osteole opening posteriorly; evaporatorium occupying mesal 

 two-thirds of segment. 



Legs: Moderately large; anterior tibia (fig. 122) not surpassing 

 tarsal insertion, dorsally with nine to ten stout, blunt spines; posterior 

 tibia strongly compressed, curved, with rov.s of spines restricted to 

 dorsal and ventral margin, spines of posteroventral margin much 

 longer and more slender than those of dorsal margin ; tarsal I longest, 

 II shortest. 



Sternites: Polished, wdth few punctures, especially laterally; each 

 segment laterally with one or two setigerous tubercles submarginally. 



Terminalia: Male genital capsule slightly emarginate at middle 

 apex. 



One nymph, a third-instar, was available for study. It showed the 

 semicircular foliaceous lobe on the labium, the submarginal row of 

 hairlike setae on the head, and the differences in the vestiture of the 

 posterior tibia. 



Type of genus. — Oi Lobostoma Amjot and SerriWe {1843) , Cydnus 

 giganteus Burmeister (1835, p. 375), designated by Kirkaldy (1903, 



