INVESTIGATIONS ON THE MUTILLID WASPS 289 



131. DASYMUTILLA SERENITAS. new species 



Plate 4, fig. 35 



Male. — Black, a very large, transverse, yellow spot covering most 

 of the apical half of the second abdominal tergite ; abdomen clothed 

 above with pale yellow pubescence posterior to the middle of tergite 

 2 ; second sternite with a small median pit, densely filled with hairs ; 

 length, 10 mm. 



Head entirely black, clothed throughout with sparse, long, erect, 

 black pubescence; mandibles acute at the apex (dentition within 

 worn, not determinable) ; anterior margin of clypeus distinctly bi- 

 dentate medially ; clypeus densely punctate ; scape with a single dis- 

 tinct carina beneath, densely punctured; first segment of flagellum 

 slightly shorter than the second (measured dorsally) ; antennal 

 scrobes not carinate above; front with large, more or less confluent 

 punctures; vertex with large contiguous punctures, vertex distinctly 

 depressed laterally at the posterior margin; genae with small, sepa- 

 rated punctures, not nearly as coarsely sculptured as the front ; rela- 

 tive widths of head and thorax, 5.25-5.75. 



Thorax entirely black, clothed throughout with sparse, long, erect, 

 black pubescence, cephalic face of pronotum somewhat punctate 

 laterally, glabrous, impunctate, and slightly emarginate medially, not 

 rounding evenly into the dorsum; pronotum, mesonotum, and scutel- 

 lum densely, coarsely punctate; tegulae somewhat setigerously punc- 

 tate at the basal margin, and laterally at the base, for the most part 

 glabrous, impunctate; propleura densely punctate dorsally, finely 

 punctate medially, indistinctly sculptured elsewhere; mesopleura 

 with large, separated punctures, interspersed anteriorly with fine 

 punctures ; metapleura glabrous, impunctate, except for a few, large, 

 scattered punctures ventrally; sides of propodeum glabrous, a few, 

 scattered obscure punctures anteriorly, and with large, coarse punc- 

 tures along the posterior margin ; posterior face and dorsum of pro- 

 podeum coarsely, foveately punctured. 



Abdomen black, a very large, transverse, yellow spot covering most 

 of the apical half of the second abdominal tergite ; clothed with long, 

 erect, sparse, black pubescence, except tergites from middle of the 

 second with long, erect, pale yellow pubescence; apical fringes of 

 first tergite and all the sternites black, of tergites 2-6, pale yellow; 

 first segment strongly nodose; first tergite coarsely, densely punc- 

 tured except the disk anteriorly with scattered punctures; second 

 tergite with moderate, separated, elongate punctures; tergites 3-6 

 with small, dense punctures, ultimate tergite punctate basally, the 

 pygidial area irregularly rugose, the apical margin without a fringe 

 of short, erect, hairs ; longitudinal carina of first sternite not promi- 

 nent nor dentate, the sternite indistinctly, coarsely punctured; second 



