WALSH DESCRIPTIONS OF N. AM. HYMENOPTERA. 87 



stained with yellow beneath. Thorax subglabrous, polished, with the 

 tegulae, a short line below the front wing, a short line tapered to a point 

 in front adjoining the humeral suture below, and a large elongate spot, 

 clavate and hooked backwards at tip, adjoining it above, all three spots 

 contiguous, and an elongate spot in front of the middle coxa, pale yellow. 

 Metathorax finely rugose with the carinae subobsolete. Abdomen with the 

 whole of the 1st and the basal half of the 2d joint finely rugose or almost 

 glabrous, the normal carina? of joint 1 only indicated by a slight but broad 

 depression fading out before it attains the tip, which tip on each side is 

 furnished with a polished, transverse, short carina or tubercle. The rest 

 of the abdomen is subglabrous and polished. No transverse carina? ex- 

 cept on joint 3, and even there it is indistinct. The terminal \ of joint 2 

 and the whole of joint 3 rufous. Venter basally rufous, towards the tip 

 blackish. Legs pale rufous, the coxae and trochanters of all 6 yellowish- 

 white. Wings hyaline, veins and stigma black, the stigma but slightly 

 paler at base and about twice as long as wide. Length o* -i8 inch. Wing 

 <J .19 inch. 



One % ; 2 unknown to me. Sufficiently distinct from all but 

 the preceding two species by the red-banded abdomen, and from 

 those by the immaculate hind tibia? and scutel, and the nearly 

 smooth metathorax and ist abdominal joint. 



Section 2. — Areolet present. 



liassus semifasciatlis, n. sp. — o*-— Black. Head subopaque, with very 

 minute, close-set, shallow punctures, more sparse on the vertex. Clypeus 

 describing a circular arc, posteriorly of 90 with the fovea?, as usual, placed 

 in the suture, £ of the way from the outer angle, anteriorly of 30 with the 

 middle J of the arc renexed. Face except the terminal fovea?, broad orbits 

 almost reaching the vertex, clypeus, mandibles except their teeth, and 

 palpi, all yellowish-white. Antennae f as long as the body, brown-black, 

 the liagellum tinged with rufous beneath, and its first joint with white; 

 the scape yellowish, white beneath. First joint of flagellum 4 times as long 

 as wide. Thorax polished, with very minute, but not close-set, shallow 

 punctures. Metathorax more coarsely rugoso-punctate, subopaque, and 

 with the lateral carinate areas distinct, but without any cross-carina?. 

 Tegula?, a line under the front wing, a quadrate spot before the tegula un- 

 der the humeral suture, a broad line clavate and slightly hooked back- 

 wards at tip overlying the humeral suture nearly to its tip, all three of 

 these spots contiguous, the scutel and a short transverse line behind it, 

 the entire prosternum, the anterior margin of the mesosternum nearly up 

 to the wing, an unabbreviated vitta near the bottom of its pleura and 

 another which is abbreviated behind still lower down, and the anterior 

 margin of the metasternum up to the wing, all white. Abdomen narrower 

 and less flattened than usual, subopaque on joints 1-4, with confluent fine 

 punctures obsolete towards the tip, and the tips of the joints which are 

 subpolished. Joint 1 longer by £ than wide, with a lateral, spiraculiferous 



