594 PROCEEDINGS OF THE NATIONAL MUSEUM vol. in 



(0.86-1.00). Labial segments: I, 0.68(0.63-0.73); II, 0.99(0.96-1.03); 

 III, 1.21 (1.16-1.26); IV, 0.76(0.70-0.83). 



Pronotum: Length-width ratio, 2.32(2.10-2.55) :4.63(4.26-5.00). 



Scutellum: Length-width ratio, 2.92(2.70-3.15) :2.92(2.70-3.15). 



Length of body: 8.53(7.92-9.14). 



Type data. — Holotype male and allotj^pe female (both Car), 

 "Chapada, Brazil, Ace. No. 2966, Aug." Paratypes, 3 males, 3 

 females, as follows: 



Brazil: Chapada, same data as types, 1 female (Car). Manaus, Amazonas, 

 November 1941, 1 male (Carv). 



Panama: Canal Zone: Barro Colorado Island, October-November 1941, 

 J. Zetek, No. 4915, 1 male (USNM); April 1941, J. Zetek, No. 4985, 1 male 

 (RCF). 



British Guiana: Kartabo, June 18, 1925, C. C. Searl, 1 female (CalAc). Upper 

 Kutari River, January-March 1936, G. A. Hudson, I female (BrM). 



Discussion. — The extremely large head (fig. 62) marks this as 

 being quite distinct from all other Cydnidae of the Western Hemi- 

 sphere. In all the males and some of the females studied the surface 

 of the head was distinctly concave, in the other females flattened with 

 the juga longitudinally depressed along the middle. The punctation 

 of the head appears to become a little more numerous and dense in 

 the specimens from the southern part of the range, but the very broad 

 head and the unusual, deep, U-shaped notch at the apex of the genital 

 capsule of the male confirm that they all belong to one species. 

 One of the Chapada females listed among the paratypes appears to 

 be a malformed individual and so was not included in the measure- 

 ments given above; the pronotum w^as shrunken and reduced in size, 

 as was the apical part of the scuteUum, with a consequent change in 

 size and shape of these two parts. 



Dallasiellus {Ecarinoceps) reflexus, new species 



Plate figure 26 



Diagnosis. — The high bucculae whose posterior termination is 

 abrupt, not evanescent, mark this species within the subgenus. 



Description. — Known from tliree females. Oval, widest at mid- 

 length. 



Head: Length two-thirds width, 1.22(1.17-1.30): 1.84(1.75-1.92); 

 interocular width, 1.12(1.04-1.17); anterior outline a faintly flattened 

 semicircle; clypeus as long as juga, distinctly narrowed apically; juga 

 impunctate, with few weak, radiating rugae and but one submarginal 

 setigerous puncture in front of eye; ocelli small, separated from eye 

 by almost twice transverse ocellar width; jugum ventrally and 

 maxillary plate, except at base, shining, impunctate. Antennal 

 segments: I, 0.35(0,33-0.40); II, 0,63(0.60-0.66); III, 0.53(0.53-0.53); 



