WALSH DESCRIPTIONS OF N. AM. HYMENOPTERA. 67 



d Differs from tf scutellata only as follows : 1. As in $ coccinea, the cly- 

 peus is scarcely rugose, while in all my $ scutellata it is very obviously so. 

 2. The thorax is entirelv bright sanguineous, except the prothorax, tegulae, 

 a large mesonotal spot above the origin of each of the 4 wings, the lower 

 surface of the mesosternum, and the metanotum, which are all black ; but the 

 basal plates are pale fuscous. 3. The abdomen is bright sanguineous, with 

 only the tip of the last ventral joint fuscous. 4. The front wings are fuligi- 

 nous up to the stigma, hyaline beyond the stigma. Length tf .28 inch. Front 

 wing 6* .28 inch. 



One 6% two ?. Fabricius, as Mr. Norton kindly informs me, 

 describes his coccinea as " Sanguineous ; back of the thorax and 

 die legs black ; wings obscure cyaneous, hyaline at the apex." 

 From such a brief notice it is impossible to decide whether my 

 species is identical with his, and the point can only be determined 

 from inspecting his original specimens, if still in existence. Argu- 

 ing such questions as these is simply labor lost, and scientifically 

 as unprofitable as puzzling over any other archaeological enigma. 

 My 6* might be taken for an extreme variety of scutellata, but for 

 the different sculpture of the clypeus and the conspicuous hyaline 

 tips to the wings. The d 1 head being black and the ? head san- 

 guineous is very remarkable and unusual in Tenthredinidce, and 

 possibly the 6* may be a distinct species. 



HylOtOUia (llllciaria, Say, <j>. — Luteo-rufous. Head blue-black, polished 

 and glabrous. Clypeus emarginate in a very obtuse angle, finely but dis- 

 tinctly rugose. Labrum transverse, truncate at tip. Palpi varying from 

 pale dusky to whitish. Antennae black, J as long as the body, the last joint 

 unarmed and with fine ruga;. Thorax polished and glabrous, verging on 

 rufous above. Tegulae and metanotum, including the basal plates, more or 

 less stained with fuscous. Lower surface of the mesothorax blue-black up 

 to, but never beyond, the suture dividing it from the pleura. Cenchri whit- 

 ish. Abdomen polished and glabrous, rarely with a fuscous dorsal dot at 

 the tip of joints 3-5; the sheaths (last ventral), except sometimes their ex- 

 treme base, blue-black; ovipositor concealed. Legs blue-black; tarsi black- 

 ish, the 1st joint of the hind tarsi sometimes whitish on the basal |. Wings 

 clouded with fuliginous, darker along the costal margin with some blue- 

 black reflections. Veins, costa and stigma black. Length $ .27-. 35 inch. 

 Front wing $ -30--34 inch. 



d* Differs from $ only as follows : — 1. The antennae are § as long as the 

 body, the usual hairs on the last joint nearly as long as the joint is wide. 



2. The tegulae and the entire thorax above and below, except the cenchri 

 which are whitish and the basal plates which are luteo-rufous, are blue-black. 



3. The abdomen is immaculate. 4. The wings are several shades paler, but 

 there is an obvious darker cloud extending from the base of the stigma to 



