618 PROCEEDINGS OF THE NATIONAL MUSEUM vol. in 



GalXpagos islands: Galdpagos Island, Pinchot Exp., June 1929, A. K. Fisher, 

 2 males, 2 females (RCF, USNM). Chatham Island, June 30, 1933, 1 male 

 (JCL). 



Discussion: The distribution of murinus presents an interesting 

 problem. Here is a species occurring in two areas separated by some 

 600 miles of ocean barrier. Is its appearance on the Galdpagos Islands 

 due to the ocean currents that flow from the mainland to the islands, 

 or was man and his machines the agent of dissemination? Either way, 

 it is interesting to note that Van Duzee's species is not one of the 

 animals of the Galdpagos Islands whose range is restricted to them. 



Dallasiellus (Dallasiellus) orchidiphilusy new species 



Plate figure 278 



Diagnosis. — This new species is most easily recognized from all 

 other species within the genus by the very short second antennal 

 segment, which is distinctly shorter than the first and just about half 

 as long as the third. 



Description. — Male: Oval, widest slightly posterior to mid- 

 length. 



Head: Length about two-thirds width, 0.74(0.70-0.86): 1.12(1. 10- 

 1.16); interocular width, 0.69(0.67-0.70); anterior outline less than a 

 semicircle, clypeus as long as juga and slightly narrowed apically; 

 surface weakly convex, shining, with few minute punctures anterior 

 to each ocellus and obsolete rugae subapically; jugum with one 

 submarginal setigerous puncture next to eye and one or two short, 

 stout pegs at apex; ocelli small, separated from eye by space almost 

 three times transverse ocellar diameter; jugum ventrally and maxillary 

 plate shining, impunctate. Antennal segments: I, 0.25(0.23-0.26); 

 II, 0.15(0.14-0.17); III, 0.31(0.30-0.33); IV, 0.32(0.31-0.33); V, 

 0.41(0.40-0.43). Bucculae almost as high as labial II; labium reach- 

 ing between middle coxae. Labial segments: I, 0.39(0.36-0.41); II, 

 0.57(0.53-0.61); III, 0.45(0.43-0.48); IV, 0.32(0.30-0.36). 



Pronotum: Length about half width, 1.18(1.10-1.23) :2.39(2.21- 

 2.53); anterior margin shallowly emarginate; side margin entire, not 

 sinuate, with four or five submarginal setigerous punctures; trans- 

 verse impression marked by irregular, medially interrupted band of 

 strong punctures; anterior lobe with large punctures paralleling 

 anterior margin and in large patch laterally, and with numerous 

 minute punctures intermixed with large ones to form a line either 

 side of midline and scattered over calli; posterior lobe with scattered 

 large punctures discally and in patch laterally, with few minute 

 punctures scattered over surface. 



Scutellum: Length equal to or little longer than width, 1.48 (1.36- 

 1.62) : 1.45(1.36-1.55); disc shining, with few coarse punctures or 

 none, and numerous weak, minute punctures. 



