CYDNIDAE OF THE WESTERN HEMISPHERE FROESCHNER 359 



The features which show geographic significance are the head, the 

 corial pattern, and the punctures of the sternites. The head shows 

 a progressive shortening in the three forms from the longest condition 

 in the northern one to the shortest in the southwestern form. The 

 northern form has the anteocular length distinctly more than half 

 the anteocular width, 55 (52-57) percent as compared to a comparable 

 ratio of 45 (41-47) percent in the southwestern form. The gap be- 

 tween these figures is bridged by the common southern form, 49 

 (40-55) percent. In the northern form the obliquely and very strongly 

 elevated jugal margins are higher than the level of the head (fig. 19), 

 which is in contrast to the condition in the other two forms where 

 the juga are much less elevated and are lower than the dorsum of the 

 head. In addition, the dorsum of the head of the southern and south- 

 western forms are closely punctured to the margins, while in the north- 

 ern form a broad, marginal band is virtually unpunctate. 



The corium of the northern and southwestern forms have, in addi- 

 tion to the narrow pale costal margin, a prominent, angulated, creamy 

 white mark at the tip of the radial vein. The southwestern form 

 usually also shows a small, rather inconspicuous, premedian whitish 

 spot on the corium. The southern form lacks these additional pale 

 maculations. 



In a series of specimens the southern form appears to have the 

 lateral punctures of the sternites weaker and sparser than the same 

 punctures of the other forms. This character, however, is difficult 

 to evaluate and put into words, so no further use will be made of it 

 in this study. 



Key to the subspecies of Sehirus cinctus 



1. Jugal margins (in profile) elevated above dorsum of head (fig. 19); corium 



with angled whitish mark at apex of radial vein . albonotatus Dallas (p. 359) 



Jugal margins (in profile) lower than dorsum of head ; corium with or without 



whitish mark at apex of radial vein 2 



2. Corium with a prominent, angled, whitish mark at apex of radial vein and 



usually also an inconspicuous premedian pale dot. 



texensis, new subspecies (p. 363) 

 Corium with no pale markings as described above. 



cinctus (Palisot de Beauvois) (p. 361) 



Sehirus cinctus albonotatus Dallas, new status 



Plate figures 1, 19 



Sehirus albonotatus Dallas, 1851, p. 127. 



Canthophorus cinctus St&l, 1876, p. 22 (part).— Signoret, 1884, p. 60 (part). 



Sehirus cinctus Uhler, 1877, p. 297 (part).— Distant, 1880, p. 9 (part) .— Lethierry 

 and Severin, 1893, p. 79 (part).— Van Duzee, 1904, p. 26 (part); 1917, p. 24 

 (part).— Banks, 1910, p. 101 (part) .—Torre Bueno, 1939, p. 184 (part). 



Diagnosis. — The presence of the angled whitish mark at the apex 



