CYDNIDAE OF THE WESTERN HEMISPHERE — FROESCHNER 441 



Melanaethus pensylvanicus (Signoret), new combination 



Plate figure 212 



Cydnus {Melanaethus) picinus Uhler, 1876, pi. 19, fig. 17 (figured, but not men- 

 tioned in text). 



Melanaethus picinus Uhler, 1877, p. 391 (designated as "new sp."); 1886, p. 3. 



Geotomus pensylvanicus Signoret, 1883, p. 207, pi. 4, fig. 169. — Letliierry and 

 Severin, 1893, p. 72.— Banks, 1910, p. 100.— Van Duzee, 1917, p. 22.— Torre 

 Bueno, 1939, p. 181. 



Diagnosis.' — Among the species of Melanaethus with the Large 

 terminal lobe on the peritreme, this one may be recognized by having 

 the head impunctate or with scattered minute punctures. 



Description. — Male: Oval, widest behind midlength. 



Head: Length almost two-thirds width, 0.54(0.50-0.56) :0. 84(0. 83- 

 0.86); interocular width, 0.52(0.52-0.53); anterior outlme a strongly 

 flattened semicircle, clypeus as long as juga, narrowed apically; 

 dorsum distinctly convex, with several minute punctures scattered 

 over surface; with distinct marginal carina dorsally; submarginally 

 with three widely separated setigerous punctures; ocelli moderate, 

 separated from eye by space more than twice transverse ocellar 

 width; jugum ventrally shining, impunctate; maxillary plate with 

 crowded punctures. Antennal segments: I, 0.15(0.13-0.10); II, 

 0.16(0.16-0.17); III, 0.19(0.17-0.23); IV, 0.24(0.23-0.26); V, 0.31 

 (0.30-0.33). Bucculae about as high as labial II, abruptly terminated 

 posteriorly ; labium attaining bases of middle coxae. Labial segments : 

 I, 0.24(0.23-0.27); II, 0.39(0.36-0.43); III, 0.28(0.26-0.32); IV, 

 0.23(0.23-0.26). 



Pronotum: Length more than half width, 0.93(0.93-0.94): 1.74 

 (1.72-1.79); anterior margin shallowly, simply emarginate; lateral 

 margin straight on basal third or half, with submargmal row of five 

 or sLx setigerous punctures; transverse impression postmedian, obso- 

 lete, not marked by special row of punctures; anterior lobe with 

 lateral patch of distinct punctures, with several minute punctures 

 medially and scattered over calli; posterior lobe with numerous fine 

 punctures across full width. 



Scutellum: Length greater than width, 1.25(1.25-1.28) :1.09(1.08- 

 1.11); surface, except basal angles, with scattered intermixed minute 

 and moderate punctures. 



Hemelytron: Clavus and corium polished; clavus with one or two 

 partial rows of punctures in addition to the complete one; mesocorium 

 with two complete rows of punctures paralleling claval suture, else- 

 where with scattered punctures becoming coarser and closer basally; 

 exocorium with irregular punctation, punctures most numerous sub- 

 costally; costa straight on basal third, diverging, with one setigerous 

 puncture located dorsally near base; membranal suture straight. 



