608 PROCEEDINGS OF THE NATIONAL MUSEUM vol. in 



Tiirrialba, collection Shild-Burgdorf" and a label "EcHnopus 

 holomelas." 



Discussion. — Although the type locahties of the two specimens are 

 somewhat removed from each other, the detected differences evident 

 between the holotype and allotype are not sufficient to indicate specific 

 distinctness. 



Dallasiellus (Dallasiellus) interruptus, new species 



Plate figures 108, 275 



Diagnosis. — The shape of the mesopleural evaporatorium, which 

 is interrupted near posterior margin (fig. 108), not only suggested the 

 name for the species but is also reliable for separating it from all other 

 species within the subgenus except dilatipes, which has highly polished 

 coria. 



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

 widest at about mid-length. 



Head: Length about two-thirds width, 1.56:2.29; interocular width, 

 1.36; anterior outline evenly curved, shallowly semicircular, clypeus 

 as long as juga; latter with weak, radiating rugae with moderate 

 punctures in between; submarginal setigerous punctures a row of 

 four close-set punctures in front of eye and one more widely removed 

 distally; ocelli moderately large, separated from eye by a space that 

 is about IK times transverse ocellar width; jugum ventrally polished, 

 impunctate; maxillary plate basally alutaceous, wealdy punctate. 

 Antcnnal segments: I, 0.46; II, 0.70; III, 0.56; IV, 0.84; V, 0.95. 

 Bucculae as high as labial II; labium reaching between middle coxae. 

 Labial segments: I, 0.96; II, 1.40; III, 1.40; IV, 0.96. 



Pronotum: Length more than half width, 2.79:5.21; anterior 

 margin deeply and doubly emarginate; side margins entire, not sinuate, 

 with submarginal row of six setigerous punctures; transverse impres- 

 sion weak across full width, marked by punctured band which extends 

 onto posterior lobe at middle; anterior lobe with numerous distinct 

 punctures laterally and few in curved row behind anterior emargina- 

 tion. 



Scutellum: Longer than wide, 3.71:3.13; polished, impunctate 

 apically and at basal angles, discally with numerous, crowded, coarse 

 punctures becoming finer toward apex. 



Hem elytron: Corium and clavus distinctly alutaceous; latter with 

 one complete and basal half of another longitudinal row of punctures; 

 mesocorium and exocorium with numerous punctures over most of 

 surface, former with two complete rows of slightly coarser punctures 

 paralleling claval suture; costa with two setigerous punctures; mem- 

 branal suture straight; membrane little longer than basal width, very 

 slightly surpassing apex of abdomen. 



