MASARIS. 9 



white above or rather exteriorly, the two basal joints more or less 

 black above at base, the fourth, fifth, and sixth joints at tip 

 beneath, and the whole of the remaining joints beneath, pale ful- 

 vous; the club above at tip, more or less black ; the five articu- 

 lations of the club are closely soldered together, the sutures 

 indistinct. Wings as in M. vespo ides %. Legs shaped as in 

 Vespoides % , except that the anterior tarsi are scarcely ciliated, 

 and the basal joint of the posterior tarsi is scarcely as long as the 

 four remaining joints together, shaped like that of Vespoides % ; 

 shining black; all the segments except the terminal one, with a 

 continuous pale lemon-yellow band ; those on the five basal seg- 

 ments more or less emarginate on each side anteriorly ; the band 

 on the sixth segment generally entire ; apical segment black, 

 polished, deeply bifid or forked at tip when viewed from above; 

 when, viewed in profile the tip is rather broad and obtusely 

 emarginate, the lower process being the shortest and stoutest ; 

 when viewed endwise the tip has a subtriangular shape, concave, 

 more or less lemon-yellow, with the lower process rather deeply 

 emarginate ; venter flattened, shining black, most of the segments 

 with a lateral yellowish spot ; the second segment with a more 

 or less developed fold anteriorly, obtusely emarginate on the 

 middle ; on the disk of the third segment a large, robust, well- 

 developed process, obtuse at tip, but with a short, stout, subacute 

 spine posteriorly, similar to that of Vespoides %. but less 

 developed. Length 5 lines ; expanse of wings 9 lines. 



This species is nearly the miniature of Vespoides, but is never- 

 theless a very true species. 



The male differs from that of M. vespoides in several points of 

 structure, viz., the club of the antennas is rounded and not flat- 

 tened beneath, the basal joint of the posterior tarsi is scarcely as 

 long, while in Vesjioides % it is almost twice as long as the re- 

 maining joints ; the apical segment of the abdomen differs much 

 from Vespoides %, in having no carinas on the disk, and in the 

 tip being much more deeply bifid, both above and beneath, and 

 the projection on the third ventral segment more robust, and not 

 compressed or emarginate at tip as in Vespoides %. 



In the ? the thorax is less depressed, but a little more than in 

 marginalis. The yellow ornaments are more abundant ; the 

 abdominal fascias entire. The scutellum is carinated, while it is 



