158 TRANS. ST. LOUIS ACAD. SCIENCE. 



tarsal tips fuscous. Hind legs with their 2d trochanters white ; the upper 

 face of their ist trochanters, the tibiae, and the tarsi, black; the second and 

 third ^ of the tibiae white. Spurs whitish. Wings subhyaline; veins black; 

 radius rufous ; stigma black, its extreme base whitish. Radial area with 

 its posterior angle about 120°. Length $ .30 inch. Front wing 9 .29 inch. 



One ? ; c? unknown to me. Has the general appearance of 

 \Pliyiodietus vulgaris, Cress.], but is generically very distinct. Dif- 

 fers from Cryptocentrum lineolatum, Kirby (Lat. 65°), in the face, 

 orbits, and inferior surface of the scape, not being white ; in the 

 abdominal white fasciae not being interrupted behind, and in the 

 smaller size (.30 instead of .50 inch). 



Xylonomus [albopiCtUS, Cress., Trans. Am. Ent. Soc. iii. p. 168.]—$. 

 — Black. Head subpolished, with very minute, sparse punctures, and on 

 the face with some rugae. Face projecting beyond the eyes J of their shorter 

 diameter. Clypeus pale rufous, slightly longer than the flagellum of the 

 antennae is wide. Labrum semicircular, very pale rufous. Mandibles un- 

 armed. Palpi pale luteous. Orbits very wide on the occiput, but with a 

 very narrow interruption just beneath the antennse and a wide one on the 

 vertex, and also two dots transversely arranged on the disk of the face, all 

 white. Antennae | as long as the body, perceptibly clavate at tip; the ist 

 joint of the flagellum thrice as long as wide ; joints 3-5 a little longer than 

 I ; 2, 6 and 7 about equal to i. Joint 10-13 of the flagellum white. Thorax 

 6ubopaque,with very minute, dense ruga;, coarse on the pleura of the meta- 

 thorax but subobsolete on the front ^ of its notum, which is subpolished. 

 Carinate areas of the metathorax all present, save that the basal area is 

 obsolete by the confluence of its two sides. Central area [| longer than wide, 

 truncate-ovate, with its base angular. Lateral areas apically prolonged in 

 a somewhat slender thorn directed upwards and backwards. Tegulae, a 

 line under the front wing, a line underlying the humeral suture nearly to 

 its tip from a little in front of the tegula, a transversly oblong spot on the 

 scutel and a line behind it, posterior declivity of the metathorax including 

 its thorns, and a line on the anterior edge of its pleura, all white. Meso- 

 notum in front of the scutel rufo-piceous. Abdomen subopaque, with very 

 minute, dense rugae. Joint i thrice as long as wide, thrice as wide behind 

 as before, the two carinae indistinctly traceable to the tip, where they coalesce 

 in a subpolished tubercle, but with the space between them level ; the sides 

 of the joint straight, save that the spiraculiferous tubercle is placed f of the 

 way to their tip. Joint 2 with a deeply indented stria cutting off an isosce- 

 les triangle on its basal corner, so that the stria strikes the side of the joint 

 \ of the way to its tip, from which point proceeds a short, shallow stria 

 sloped the contrary way. Joint 2 longer by \ than wide ; 3 wider by \ than 

 long; 4-7 short; 8 as long as wide; 7 and 8 concave above, and 8 tapered 

 and obtusely pointed when viewed from above, acutely pointed in profile. 

 Joint I with a lateral, longitudinally oval, white spot at tip; 2 with a lon- 

 gitudinally obsemioval spot at tip; 3-7 with terminal white fascia, inter- 



