CYDNIDAE OF THE WESTERN HEMISPHERE — FROESCHNER 521 



Legs: Posterior tibia distinctly compressed, gently widened to 

 apical third. 



Sternites: Polished, minutely punctate, with several short rugae 

 in spiracular area. 



Terminalia: Genital capsule shining, irregularly punctate, more 

 densely so laterally, apical margin slightly concave either side of small, 

 median angulation; gonostylus as illustrated (fig. 242). 



Length of body: 10.71. 



Female: Similar to male but differing in less distinct subapical 

 impression on pronotum, more distinct rugae on head, and more 

 uniform punctation on apical two-thirds of corium. 



Head: Length-width ratio, 1.93(1.91-1.95) :2.91(2.86-2.96); inter- 

 ocular width, 2.02(2.02-2.02). Antennal segments: I, 0.61(0.60-0.62); 

 II, 0.52(0.50-0.55); III, 0.73(0.67-0.80); IV, 0.71(0.70-0.73); V, 

 0.81(0.80-0.83). Labial segments: I, 1.19(1.16-1.23); II, 1.87(1.86- 

 1.89); III, 2.27(2.12-2.42); IV, 1.64(1.56-1.72). 



Pronotum: Length-width ratio, 3.75(3.75-3.75) :6.30(6.28-6.32). 



Scutellum: Length-width ratio, 4.86(4.80-4.92) :3.90(3.90-3.91). 



Length of body: 11.03(10.90-11.08). 



Type data. — Dallas described the type (BrM) as being from 

 "Columbia [!]." 



Specimens studied. — 1 male, 2 females. 



Mexico: Chiapas: Volcdn de Tacand, 9,100 feet, Mar. 30, 1939, P. Brodkorb, 

 1 female (MMZ). 



Guatemala: Purulhd, May 16, 1 female (USNM). 



Ecuador: El Topo, Oct. 5, 1944, E. J. Hambleton, 1 male (USNM). 



Discussion.- — Notes based on the type and furnished by Dr. W. E. 

 China in correspondence has enabled the author to associate Dallas' 

 name with this form. C. grossus and C. teter are rather closely allied 

 to each other but separate easily from the other two forms in the 

 subgenus as indicated in the key. From each other, these forms may 

 be best separated by the head and costal characters listed in the key, 

 but in addition one may often use the greatly elongated labium, 

 which in grossus always reaches sternite IV and in teter seldom sur- 

 passes the posterior coxae. 



Cyrtotnenus {Syllobiis) marginalis Signoret 



Crytomenus marginalis Signoret, 1881b, p. 201, pi. 6, fig. 21. — Lethierry and 

 Severin, 1893, p. 62. 



Diagnosis. — The elongate second antennal segment, which is here 

 equal in length to the third, or the large number of setigerous punc- 

 tures in lateral submarginal row on the pronotum, or the numerous 

 setigerous punctures on the costa will separate marginalis from all 

 other members of the genus. 



