186 Trans. Acad. Sci. of St. Louis. 



slender, the bind tarsi moderate in length but slender, with the basal 

 joint about as long as the next two combined; tarsal claws long, equal. 

 Nearctic and Palaearctic regions Tachynsa 



5 — Mesosternal process very finely pointed, free, long, extending rather 



beyond the middle of the acetabula and separated from the metasternal 

 projection by a narrrow unimpressed isthmus 6 



Mesosternal process much more abbreviated and broader, not extending to 

 the middle of the acetabula, free, separated from the metasternal pro- 

 jection by a short unimpressed isthmus, the middle coxae less approxi- 

 mate 7 



Mesosternal process still shorter, the tip not at all free, broadly rounded 

 or truncate and separated from the metasternal projection by a short 

 but depressed isthmus, the coxae more or less widely separated 8 



6 — Body rather stout, the prosternum short but strongly and posteriorly 



angulate before the coxae ; bead large, truncate at base, the eyes small, 

 the antennae much elongated, the third palpal joint but little longer 

 than the second, both unusually elongated; neck rather narrow, about 

 a third as wide as the bead ; prothorax obtrapezoidal, wider than long, 

 broadly impressed along the middle, rather acutely but broadly im- 

 pressed along the median line; elytra normal; abdomen broad, feebly 

 punctured, the three basal tergites impressed at base, the first more 

 broadly; legs moderately long, the basal joint of the hind tarsi longer 

 than the next two combined ; integuments finely, closely sculptured and 



dull . Europe *Xenu8a 



Body slender, parallel, very small in size, shining and sparsely punctu- 

 late; connecting isthmus between the intermediate coxae unusually 

 long, the metasternal projection very short, truncate, the dividing 

 suture fine; head well developed, truncate at base, the palpi 

 rather short, normal, the eyes small, the antennae short and stout, 

 the subapical joints transverse; neck scarcely half as wide as the 

 head; prothorax wider than long, obtrapezoidal and evenly convex, 

 transversely impressed before the scatellum; elytra nearly as in 

 Tachyusa; abdomen parallel and very evidently narrower than the 

 elytra, the first three tergites rather strongly, subequally impressed 

 at base; legs slender, the hind tarsi rather long, the basal joint 

 longer than the next two combined . Pacific Coast of America. 



Gnypetella 



7 — Form stouter, the size less minute, the integuments extremely mi- 



nutely, sparsely punctulate and polished throughout; prosternum 

 short though strongly and posteriorly angulate; bead moderate, 

 rounded behind the eyes, the latter well developed and generally 

 prominent; antennae more or less long and slender; prothorax 

 wider than long, obtrapezoidal, with the sides more angulate an- 

 teriorly and thence more sinuate to the base than in Onypeta, but 

 with the short transverse impression before the scutellum as in that 

 genus; elytra well developed, convex; abdomen nearly as wide as 

 the elytra as a rule, with the first three tergites subequally and 

 narrowly though deeply impressed at base; legs rather long and 



