82 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiii. 



dermatini^ has nothing- to do with this tribe, but refers to Forstcr's 

 famih^ T7Xichynotoid(je., treated in this paper as a tribe under the name 

 NototrycTihii^ in the subfamily Oph'ionhim. 



The tribe Tyleconmini is intermediate between the Exochini and 

 Sphinctlni, but is easily distinguished by the characters made use of 

 in my table of tribes. 



Only live genera are known, four being peculiar to North America 

 and one to Europe, separable as follows: 



TABLE OF GENERA. 



Eyes normal, not emarginate 2 



Eyes emarginate. 



Abdominal segments 1-3 tmlh parallel dorsal carinae; scutellum margined at 

 sides (632) Pseudomeiophis Davis. 



2. Face transverse, the clypeus more or less separated 3 



Face elongate, the clypeus not separated. 



(633) Tylecomnus Holmgren = Trachyderma Gravenhorst. 



3. Claws pectinate 4 



Claws not pectinate. 



Scutellum depressed; abdominal segments constricted at base; head with a 



spine between the antennae ( 634 ) Th ihetoidea Davis. 



Scutellum elevated; abdominal segments and the head normal. 



(635) Leihades Davis. 



4. Scutellum elevated; abdominal segments 2— 4 constricted at base; clypeus large, 

 prominent , (636) Catocentrus Walsh. 



Tribe IX. SPHINCTINI. 



1868. Sphmctoid.v, Family 19, Forster, Verb. d. naturli. ^'er. ](r. Rheinl., XXV, 



1868, pp. 143 and 170. 

 1894. Sphinctini, Tribe IX, Ashmead, Proc. Ent. Soc. Wash., Ill, p. 277. 



This tribe is represented by a single genus Sphinctus Gravenhorst. 



It comes nearest to the tribe Tylecomr^ini, so far as the characters of 

 the legs and the venation of the front wings are concerned, but it is 

 readily distinguished by the distinctly petiolated abdomen, the abdomen 

 being long and narrowed into a distinct petiole anteriorly, the spiracles 

 of same being prominent and placed hc/nnd the middle. 



These characters, with the following, render the genus easy of 

 recognition : 



Submedian cell in front wings longer than the median, the areolet triangular, sub- 

 sessile; transverse median nervure in the hind wings broken at or very near the 

 middle; abdomen petiolate, rather strongly punctate. 



(637) Sphinctus Graven liorst. 



1 Trans. Am. Ent. Soc. XXIV, 1897, p. 195. 



