ERCHOMUS.—TACHINODERUS. 307 
little uneven, but only sparingly and indistinctly punctate; they are broadly but vaguely 
depressed near the side, and the external angle is broadly rounded. The hind body is 
only sparingly and indefinitely punctate. 
This insect is rather narrower than E. flavipalpis, and is readily distinguished by the 
very shining thorax and elytra, and the depression near the side of the latter; the 
mesosternal carina is large and presents at its upper anterior termination a free angle, 
and the middle of the front edge of the mesosternum is tuberculate. Only three 
individuals have been found. 
24. Erchomus mollis. 
Minus latus, convexus, niger, nitidus, subtus piceus ; antennis, pedibus partibusque oris testaceis, illis brevibus, 
articulis 4°-10™ transversis ; capite, thorace elytrisque nitidissimis fere impunctatis ; abdomine minus nitido, 
parce subtilissime punctulato. 
Long. 3 millim. 
Hab. GuateMata, Cerro Zunil 4000 to 5000 feet (Champion). 
Antenne short and stout; third joint small, only half as long as the second joint; of 
the following joints each is broader than its predecessor, so that the penultimate joints 
are strongly transverse; the terminal joint is elongate, longer than the two preceding 
together. Head very short. Thorax with the base not sinuate; the hind angles 
rounded, but not largely so. Hlytra flat at the sides, but not impressed; the hind angle 
but little rounded. Hind body not so pointed behind as in many other species; the 
terminal segments picescent or rufescent; the terminal segment almost destitute of 
teeth. 
This is a very aberrant species; the middle coxe are very approximate, and there is 
only a very fine and obscure raised line between them; the metasternum is very short, 
the internal lamine of the posterior coxe very small, the tarsi slender and rather 
short; the epipleurz are very largely developed, quite folded in, so that the free 
trenchant sides of the elytra are very conspicuous when the underside of the insect is 
inspected. 
Five individuals have been found; they are in very decayed and fragmentary 
condition. 
TACHINODERUS. 
Tachinoderus, Motschoulsky, Bull. Mosc. 1858, ii. p. 217; Fauvel, Ann. Mus. Gen. xii. p. 276. 
Tachinomorphus, Kraatz, Wiegm. Arch. 1859, 1. p. 54. 
This genus approaches very closely to Hrchomus by means of the more depressed 
species of that genus, such as E. segnis and £. sinuatus; but still Zachinoderus 
has, even compared with these Erchomt, the epipleure less metamorphosed from 
the Tachinus-form, and as the maxillary palpi are more largely developed, and the 
Tachinomorphi are larger insects, the genus may still be retained. Zachinoderus seems 
2RR 2 
