606 PROCEEDINGS OF THE NATIONAL MUSEUM vol. in 



14, 1946, E. C, Van Dyke, 1 female (CalAc). Jalisco: Guadalajara, March 

 1923, 1 female (USNM). Michoacdn: Ajuno, May 1923, W. M. Mann, 1 

 female (USNM). State unknown: Jalapa (USNM), "Tozi," November, 1 female 

 (USNM). 



Discussion, — The specific name alludes to the fusion of the apex 

 of the peritreme with the surrounding cuticula. This character, as 

 M^ell as the numerous coarse crenulations on the posterior margin of 

 the mesopleuron and the very deeply C-shaped metapleural evapora- 

 torium (all similar to fig. 106) point out the close relationship of Jusus 

 to the slightly more northern species of the subgenus Pseudopangaeus. 

 Although these three characteristics outweigh in number the single 

 features of the interrupted mesopleural evaporatorium, the more 

 logical placement oifusus is in subgenus Dallasiellus. To separate the 

 two subgenera on the basis of the fused peritremal apex would permit 

 placing the present species with its apparently close relatives of 

 subgenus Pseudopangaeus, but would do violence to the distributional 

 pattern by necessitating the transfer of californicus to Dallasiellus 

 (Dallasiellus) as a geographically detached species. The presently 

 accepted placement appears best in that it permits the more northern 

 species to form a closely knit offshoot of the more southern subgenus 

 by way oifusus. Further, fusus differs from all members of subgenus 

 Pseudopangaeus in lacking an angulation near the base of the postero- 

 ventral margin of the posterior tibia of the male. 



Dallasiellus (Dallasiellus) horvathi, new species 



Diagnosis. — Among the large species (over 9 mm.) of the subgenus, 

 horvathi may be recognized by the low prosternal carinae and the 

 virtual lack of punctures on the posterior lobe of the pronotum. 



Description. — From one male and one female. Male: Oval, 

 widest near midlength. 



Head: Length almost two-thirds width, 1.51:2.34; interocular 

 width, 1.43; anterior outline a full semicircle, clypeus as long as juga; 

 latter impunctate; almost smooth; submargin with four close-set 

 setigerous punctures in front of eyes and one more widely spaced 

 beyond; ocelli moderately large, situated about half way between 

 eye and midline of head, separated from eye by a space nearly three 

 times a transverse ocellar width; jugum ventrally and most of maxil- 

 lary plate polished, impunctate. Antennal segments: I, 0.41; II, 

 0.56; III, 0.70; IV, 0.80; V, 0.90. Bucculae as high as labial II; 

 labium reaching between hind coxae. Labial segments: I, 1.03; II, 

 1.66; III, 1.63; IV, 1.10. 



Pronotum: Length more than half width, 3.13:5.43; anterior 

 margin moderately, simply emarginate; side margins strongly sinuate 

 opposite ends of transverse impression, submargin with row of six 



