CYDNIDAE OF THE WESTERN HEMISPHERE — FROESCHNER 585 



6. Jugum with one submarginal setigerous puncture immediately anterior to eye; 



mesocorium in great part impunctate americanus (St§,l) (p. 585) 



Jugum with three submarginal setigerous punctures; mesocorium with 

 abundant punctation over all of surface . . . foratus (Signoret) (p. 587) 



Dallasiellus {Ecarinoceps) americanus (StSl), new combination 



Plate figures 78, 105, 264 



Aethus americanus St&l, 1860, p. 12. — Walker, 1867, p. 152. 

 Macroscyhis americanus StSl, 1876, p. 19. 



Geotomus americanus Signoret, 1883, p. 34, pi. 2, fig. 143. — Lethierry and Severin, 

 1893, p. 72. 



Diagnosis. — The peculiar shape of the mesopleural evaporatorium 

 which extends into the posterolateral angle of the segment but does 

 not reach all the way to the side margin (fig. 105) coupled with 

 presence of a single submarginal setigerous puncture on the jugum 

 will identify this species within the subgenus. 



Description. — From two incomplete males and two females. 



Male: Elongate-oval. 



Head: Length two-thirds width, 1.01(1.00-1.03) :1.56(1.56-1.56); 

 interocular width, 0.86(0.86-0.87); anterior outline semicircular, 

 clypeus as long as juga, slightly narrowed apically; surface slightly 

 convex, impunctate, with one submarginal setigerous puncture in 

 front of eye; ocelli small, on line connecting hind margins of eyes, 

 removed from eyes by about one transverse ocellar width; jugum 

 ventrally and maxillary plate (except at base) polished, impunctate. 

 Antennal segments missing except I-III on one specimen: I, 0.33; 

 II, 0.43; III, 0.46. Bucculae about as high as labial II, decurved 

 posteriorly; labium reaching between middle coxae. Labial segments: 

 I, 0.51(0.50-0.53); II, 0.88(0.83-0.93); III, 0.68(0.66-0.71); IV, 

 0.51(0.51-0.51). 



Pronotum: Length about half width, 1.71(1.70-1.71) :3. 52(3.52- 

 3.53); anterior margin concave; side margins concave opposite ends 

 of obsolete, median, transverse impression due to a peculiar "fold" in 

 margin (fig. 78); virtually impunctate except for rows paralleling 

 anterior margin and marking site of transverse impression and a 

 patch laterally on the anterior lobe. 



Scutellum: Longer than broad, 2.50(2.47-2.53) :2.07 (2.02-2.12); 

 disc shining, with a few small punctures scattered on basal half. 



Hemelytron: Corium and clavus finely and almost imperceptibly 

 (,X-30) alutaceous, impunctate except for one complete and one 

 partial row paralleling claval suture and one longitudinal row on 

 clavus; costa with one or two setigerous punctures; membranal 

 suture wealdy bisinuate, lateral angle prolonged, acute; membrane 

 subquadrate, reaching to apex of abdomen. 



