356 PROCEEDINGS OF THE NATIONAL MUSEUM vol. in 



by a wide band of distinct punctures; posterior margin broadly but 

 very weakly convex; all angles rounded. 



Scutellum: Longer than broad, triangular, apex narrowed and 

 less than half of merabranal suture; disk with numerous distinct 

 punctures over most of surface. 



Hemelytra : Areas well defined, membranal suture straight, convex 

 or moderately bisinuate; corium and clavus distinctly, closely, and 

 more or less uniformly punctured; costa thickened, impunctate, 

 inflexed part distinctly punctate; membrane less than half of hemely- 

 tral length, reaching or surpassing apex of abdomen, transparent and 

 wealdy to strongly clouded with brown. 



Propleuron: Usually punctured, sometimes tuberculate; prosternal 

 carinae very low or absent, anterior margin usually without expansions. 



Mesopleuron (figs. 86, 87) : Nearly flat, evaporative area restricted 

 to posterior tv/o-thirds or less, often reaching side margin where it is 

 sometimes extended anteriorly; shining part punctm'ed; mesosternum 

 distinctly carinate on midline. 



Metapleuron (figs. 86, 87) : Slightly convex; terminal lobe of peri- 

 treme elevated, strap-shaped or reniform, more or less shining, longer 

 than basal part; evaporative area either just surrounding osteolar 

 canal or more extensive, sometimes occupying mesal three-fourths 

 of segment; shining part vaiiously punctured. 



Legs: Moderately long, slender; anterior tibia (fig. 130) not sur- 

 passing tarsal insertion, weakly compressed, dorsal margin with 

 eight to eleven stout spines; middle and posterior legs (fig. 138) 

 terete; tarsal II shortest, I longest. 



Sternites: Moderately convex, punctured, more coarsely and 

 closely so laterally; posterior margin of sternites finel}^ denticulate 

 or crenulate. 



Terminalia: Male genital capsule opening dorsally, apical rim 

 entire or broadly and shallowly emarginate. 



Type of genus. — Cimex morio Linnaeus (1761), subsequently 

 designated by Keuter (1888) ; the several names listed in the synonymy 

 above are accepted on the authority of China (1943). 



Distribution. — The widest range occupied by any genus of 

 Cydnidae belongs to Sehirus. It has been reported, apparently 

 correctly so, from nearly all major faunal regions. The distribution 

 of the genus within the New World was indicated by specimens as 

 extending from coast to coast across southern Canada and thence 

 south to Florida, Texas, New Mexico, California, and into southern 

 Mexico. 



Discussion. — In spite of extensive literature to the contrary, the 

 present study found this genus to be the only truly Old World genus 



