CYDNIDAE OF THE WESTERN HEMISPHERE — FROESCHNER 571 



Propleuron: Punctate or not; prosternal carinae moderately to 

 very strongly elevated and lobulate. 



Mesoplcuron: Nearly flat; evaporatorium restricted (fig. 106) or 

 extending into posterolateral angle of segment (figs. 105, 107) ; meso- 

 sternum convex, more or less carinate and haired medially. 



Metapleuron: Convex; osteolar peritreme without modified termi- 

 nal lobe (figs. 106, 107) ; evaporatorium occupying mesal two-thirds 

 or three-fourths of segment; lateral area with few or no punctures. 



Legs: Moderately long; anterior tibia (fig. 129) not surpassing 

 tarsal insertion; posterior tibia (fig. 150) terete, usually simple, 

 in some males (chiefly in the new subgenus Pseudopangaeus) ventrally 

 with subbasal emargination distad of which is a decided angle (fig. 

 149). 



Sternites: Polished or alutaceous, impunctate or with few punctures 

 laterally; posterior margins of segments finely denticulate or crenulate. 



Terminalia: Male genital capsule with apical rim entire or variously 

 emarginate. 



Type of genus. — Signoret proposed Stenocoris monobasically for 

 Aethus longulus Dallas (1851, p. 119). Since that generic name had 

 been used previously by Burmeister in the hemipterous family 

 Coreidae and by Rambur in the hemipterous family Lygaeidae, 

 Signoret's application of it was invalid. Bergroth recognized this 

 and proposed for it the new name Dallasia. Unfortunately, this 

 name was also preoccupied, this time by Stokes in Protozoa so it 

 became necessary for Berg to propose yet another name, Dallasiellus, 

 for Signoret's genus. Because both of these new names were pro- 

 posed to replace Stenocoris of Signoret, they must both take Aethus 

 longulus Dallas as genotype by objective synonymy. The genotype 

 of Colohophrys Horvdth is Colohoj)hrys solitaria Horvath (1919, p. 244) 

 by original designation. The genotype of Geocnethus Horvath is the 

 African species Geocnethus obesus liorvdth (1919, p. 248) by original 

 designation. Although none of the species of the Western Hemisphere 

 is congeneric with Geocnethus, this name enters the American list 

 because Horvdth, in proposing it as new, assigned a number of Ameri- 

 can species to it. In this he has been followed by subsequent authors. 



Distribution. — From Washington and Idaho south through Cen- 

 tral America into South America as far as Argentina, and eastward 

 in the Gulf States of the United States and into the West Indies. 



Discussion. — Of all the genera of Cydnidae occurring in the 

 Western Hemisphere, this genus is the least satisfactorily defined. 

 It is a "residual area" of relatively little specialization, a "dumping 

 ground" to receive those species which do not fit into any of the more 

 strongly marked genera previously separated in the key. 



