94 TRANS. ST. LOUIS ACAD. SCIENCE. 



with the flagellum very robust except at the tip and at the extreme base 

 more or less tinged with rufous beneath, their tips a little convolute, the 

 1st joint of the flagellum twice as long as wide, all the following joints 

 shorter than wide. Thorax subpolished, with fine, rather close-set punc- 

 tures, more sparse on the metathoracic pleura- Mefathomx with 4 equi- 

 distant longitudinal carinae, which all attain the lunate area of the poste- 

 rior declivity, the 2 outi-r ones medially connected with each other by a 

 cross carina, and the two middle ones forming a central area scarcelv 

 closed at tip and twice as long as wide, which, as well as the lower part 

 of the metathoracic pleura, is glabrous and highly polished. Tegulse yel- 

 lowish-white. Abdomen as long as the head and thorax together, polish- 

 ed, with very fine, moderately dense punctures. Joint i longer by \ than 

 wide, and nearly thrice as wide behind as before; its 2 carinte extending 

 more or less distinctly | of the way to the tip, the space between them 

 glabrous but not excavated except sometimes slightly towards their tip. 

 Ovipositor rufous, seldom exserted. Legs bright rufous, immaculate. 

 Wings hyaline; veins and stigma black. Areolar cross-vein full as long 

 as usual. Length $ .20-25 inch. Front wing $ .16-18 inch. 



Six ? , two with the ovipositor exserted ; % unknown. Judging 

 from analogy, I should anticipate that the entire face of % would 

 be rufous. Differs from Mr. Cresson's description in the palpi 

 being whitish (not "piceous") in the rufous band on the face, in 

 the antennae being f (not J) as long as the body, in the ist abdo- 

 minal joint not being "canaliculate," and in the legs being bright 

 rufous (not " reddish-brown"). A specimen received from Mr. 

 Cresson agrees in all these points with mine, and seems to me to 

 be a $ ; and not a '& , as supposed by its describer. 



ExOChuS albift'Ons, [Walsh, Trans. Am. Ent. Soc. ii. p. 114].— d'$.— 

 Differ from the preceding only as follows : — i. The face projects beyond 

 the eyes scarcely f of their shorter diameter, and the clypeus is punctured 

 like the face. 2. The face, clypeus and mandibles except their teeth, and 

 in c? a small triangular spot on the vertex adjoining each eye and a very 

 narrow orbit extending just beyond the antenns, are all yellowish-white. 

 3. In ^ the 1st joint of the scapus is yellowish-white beneath ; and the ist 

 joint of the flagellum is in S 3i. in $ 2i times as long as wide, the following 

 joints about h longer than wide, and the tips % $ are not convolute. 4. 

 The 2 middle carinae of the metathorax are medially connected by a cross- 

 vein so as to form a complete basal and central area, which last is divided 

 from the posterior area by a distinct carina. 5. The tegulae, a long capillary 

 line under the front wing, a broad line clavate at base and underlying the 

 humeral suture from the tegula nearly to the tip, the whole scutel c? or a 

 wide line at its tip and sometimes also a narrower one at its sides in §, 

 and (^2 a transverse line behind the scutel, are all white. In d* the entire 

 mesosternum and its pleura, as well as that of the metasternum, nearly up 

 to the wing, in $ only a spot above the middle coxa, a patch above the 



