WALSH — DESCRIPTIONS OF N. AM. HYMEXOPTERA. 8l 



One c? ; ? unknown to me. Very near Cr. albitarsis, S Cress., 

 tut that species is said to have "rather slender" antennae, basally 

 ■*' rufous beneath" (not brown-black), and " all the coxae and tro- 

 chanters except the apical half of the posterior pair [of trochan- 

 ters] black" ; whereas in albisoleatus the 2 anterior coxae are 

 entirely rufous, the 4 posterior ones entirely black, and all the 6 

 terminal trochanters are distinctly rufous. The two may possibly 

 be identical ; but if so Mr. Cresson has made some poor describ- 

 ing. In any case, if Ischnus albitarsis, (5*, Cress., be, as I sup- 

 pose, a Cryptus, the specific name albitarsis will be here pre- 

 occupied. Distinct fiom all the preceding by the white tarsi. 



\CryftHs albitarsis. Cress., and albisoleatus,, Walsh, although closely 

 allied, are two very distinct species ; the former, which I now consider to 

 he the (^ o{ similis. Cress., has a longer and more slender antennse, black 

 anterior coxa and trochanters, a flat scutellum (which is convex in albi- 

 soleatus), a differently sculptured metathorax, and the apex of first abdo- 

 minal segment prominently nodose. — Cresson.] 



CryptUS [limatus, Cress.] — r^. — Differs from albisoleatus, (^, n. sp.? only 

 as follow^s: — I. The clypeus and vertex are punctate and opaque, and the 

 palpi are white except the last 2 joints which in certain lights are tinged 

 with fuscous. 2. The antennae are immaculate, a little less robust, joint 

 I of the flagellum being almost 2h times as long as wide. 3. The thorax 

 is subopaque and uniformly sculptured above and below; the parapsidal 

 grooves are distinct, and impressed on the anterior § (not J) ; and the 

 central area of the metathorax is quadrate and distinct except that it is 

 confluent behind with the posterior area. 4 The ist abdominal joint is 4 

 times as long as wide, and only twice as wide at tip as at base; its sides 

 parallel | of the way to the tip, where the tubercles are located and there 

 is a sudden expansion, thence nearly straight and subparallel or scarcely 

 divergent. Joint 2 as long as wide, and about 2i times as wide behind as 

 before. A subterminal, capillary, dark line on joint 3, and a medial one 

 on 4. Basal \-^ of joint i blackish; elsewhere the abdomen and venter 

 are rufous-immaculate. 5. The legs are pale rufous. All the coxje and 

 trochanters, basal ^-5 of the front femora, all but the knees in the middle 

 femora, and the whole of the hind femora, tibiae, and spurs, black. All 6 

 tarsi white, the basal i of joint i in the hind legs, and the whole of joint 5 

 in all 6 legs, black. 6. The stigma is cilil rufous edged with black. Areo- 

 let pentagonal, with its inner and outer sides parallel and its 2 hind sides 

 each about i shorter than the other 3 which are subequal. Length (^ .30 

 inch. Front wing (^ .25 inch. 



Two c? ; 9 unknown to me. Distinct at once from Cr. albi- 

 tarsis, d", Cress., and albisoleatus, c?, n. sp., by the subopaque 

 mesonotum with unabbreviated parapsidal grooves, and by the 



iii — 6 [May 20, 1873.I / 



