626 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lu 



Dallasiellus (Dallasiellus) triangularis, new species 



Diagnosis. — Among the smaller species of the subgenus this 

 species may be marked by the impunctate scutellar disc and the 

 presence of two complete rows of mesocorial punctures paralleling the 

 claval suture. 



Description. — Described from one female. Oval, slightly elon- 

 gate. 



Head: Length more than half width, 0.76:1.33; interocular width, 

 0.76; anterior outline semicircular, clypeus as long as juga and only 

 slightly narrowed apically; surface polished, impunctate; jugum with 

 two adjacent setigerous punctures next to eye and two more widely 

 spaced ones beyond; ocelli moderately large, separated from eye by 

 about twice a transverse ocellar width; jugum ventrally and apical 

 two-thirds of maxillary plate polished, impunctate. Antennal set- 

 ments: I, 0.23; II, 0.26; III, 0.36; IV, 0.48; V, 0.60. Bucculae as 

 high as labial II; labium reaching onto mesosternum. Labial seg- 

 ments: I, 0.50; II, 0.83; III, 0.63; 0.40. 



Pronotum: Length little more than half width, L49:2.73; anterior 

 margin moderately and singly emarginate; lateral margin mostly 

 straight, with sLx submarginal setigerous punctures; transverse 

 impression postmedian, very weak, marked by medially interrupted, 

 irregular or double row of mostly well-separated punctures; anterior 

 lobe impunctate except for almost straight row immediately behind 

 anterior emargination; posterior lobe impunctate except for very few 

 punctures on disc. 



Scutellum: Longer than wide, 1.89: L56; disc polished, virtually 

 impunctate. 



Hemelytron: Clavus and corium polished; clavus with partial longi- 

 tudinal rows of punctures; mesocorium and exocorium impunctate 

 except at apex and two complete rows paralleling claval suture; costa 

 with two setigerous punctures; membranal suture straight, lateral 

 angle not produced; membrane longer than basal width, reaching tip 

 of abdomen. 



Propleuron : Punctate only in depression ; prosternal carinae as high 

 as labial II, in profile acutely triangular with apex ventrally. 



Mesopleuron : Lateral area impunctate, weakl}^ rugose. 



Metapleuron: Peritreme abruptly terminated apically; lateral area 

 polished, with a row of punctures delimiting lateral margin of evapora- 

 torium. 



Sternites: Polished, impunctate except laterally near posterior 

 margin of sternite VI. 



Legs: Not specially modified. 



Length of body: 5.25. 



