CYDNIDAE OF THE WESTERN HEMISPHERE — FROESCHNER 425 



12. Pronotum with broad, shallow, punctate impression extending anteriorly 



between calli from middle of weak transverse impression (fig. G7). 



noctivagus (Van Duzee) (p. 436) 

 Pronotum not impressed between calli 13 



13. Length of body about twice pronotal width. 



punctatissimus (Signoret) (p. 445) 

 Lengthof body distinctly less than twice (77:42) pronotal width 14 



14. Apical two-thirds of mesocorial disc with numerous coarse punctures sub- 



equal to those of two rows paralleling claval suture; larger, length of body, 



3.6-4.2 robustus Uhler (p. 447) 



Apical two-thirds of mesocorial disc with scattered punctures finer than those 

 of two rows paralleling claval suture; smaller, length of body, 3.0-3.3. 



mixtus, new species (p. 434) 



15. Pronotum with transverse impression distinctly impressed across full width; 



corium polished subglal>er (Walker) (p. 437) 



Pronotum with transverse impression obsolete, absent medially; corium 

 distinctly alutaceous crenatus (Signoret) (p. 430) 



Melanaethus aereus^ new species 



Plate figure 206 



DiAGMOsis. — The small, terminal lobe of the pcritrcme coupled with 

 the very coarse, sunken, close-set punctures on the posterior lobe of 

 the pronotum and scutellum will permit recognition of aereus within 

 the genus. 



Description. — From a single male. Oval, widest behind mid-length. 



Head: Length more than two-thirds width, 0.92:1.33; interocular 

 Avidth, 0.73; anterior outline a very shallow semicircle, clypeus as 

 long as juga, narrowed apically; surface shining, with radiating rows 

 of few, coarse punctures; margin thick, submarginal dorsal carina 

 distinct only on anterior third or half of jugum; ocelli moderately 

 large, separated from eye by space greater than transverse ocellar 

 width; jugum ventrally and maxillary plate (except posteriorly) 

 impunctate. Antenna! segments: I, 0.29; II, 0.44; III, 0.39; IV, 

 0.46; V, 0.60. Bucculae about as high as labial II, posterior end 

 curved; labium reaching between middle coxae. Labial segments: 

 I, 0.49; II, 0.81; III, 0.94; IV, 0.43. 



Pronotum: Length about half of width, 1.56:3.10; anterior margin 

 deeply, simply emarginate; lateral margin broadly, shallowly sinuate 

 medially, submarginal row of five setigerous punctures; transverse 

 impression absent, marking row of punctures very coarse, sunken, 

 confused with numerous close-set punctures of posterior lobe; anterior 

 lobe with numerous coarse, close-set punctures laterally, middle half 

 strongly depressed for full length. 



Scutellum: Length greater than width, 2.29: 1.77; disc shining, with 

 numerous coarse, close, sunken punctures becoming finer at apex. 



Hemelytron: Clavus and corium strongly alutaceous; clavus with 

 one long and one short row of punctures; mesocorium with numerous 



