OF AMERICA NORTH OF MEXICO. 
317 
NECYDALIS, Lin. 
aput thorace latius, quadratum, basi subito constrictum. 
Oculi transversi. 
Antenn® filiformes. 
Elytra valde abbreviata, apice rotundata; al® rect®. 
Corpus filiforme, pedibus tenuibus, posticis elongatis. 
N. MELLiTus. Niger, tenuiter pubescens, thorace punctulato, latitudine longiore, utrinque profunde 
constricto, medio canaliculato, elytris alutaceis, parum punctatis, testaceis margine infuscato, medio 
oblique impressis, abdomine pedibus, antennarumque articulo I"”* rufo testaceis. Long. -iS_80. 
S Hald. 44. 
9 Jfecydalis americanus, Hald. 44. 
Molorchus melliius, Say. B. J. L. 194; Harris Hartford Tr., 89. 
New York to Georgia and Missouri, rare. Although Mr. Say observed what he 
has considered as both sexes of this species, I prefer citing N. americanus as the true 
female. My specimen (taken in coltu with N. mellitiis by Mr. Brevoort,) is much 
larger than the male, but only differs by its black abdomen and shorter antennse. 
The under surface of the abdomen is rufo-testaceous, as in the male. The abdomen 
is more acute and less dilated towards the tip. 
ENCYCLOPS, Newman. 
Caput thorace latius, quadratum, basi subito constrictum. 
Oculi globosi, prominuli, superne subito emarginati. t 
Elytra abdomine baud breviora, apice rotundata. 
Antenn® filiformes. 
Corpus filiforme, pedibus tenuibus, posticis elongatis. 
E. coERULEUs, —l®te viridi-®neus, opacus, thorace reticulato-punctalo, antrorsum angustato constrictoque, 
lateribus tuberculato, elytris confertim punctatis, subtus cinereo-pubescens pedibus flavis, antennis 
nigris. Long. -3. 
Hald. 1. c. Ap. 375. 
Leptura ccerulea, Say. J. Ac. 5,280. 
Encyclops palUpes, Nm. Ent. Mag. 5, 392. 
Middle and Northern States, rare. 
DESMOCERUS, Serv. 
Caput thorace angustius, postice non constrictum. 
Oculi intus valde emarginati. 
Antenn® nodos®. 
Elytra abdomine baud breviora, apice rotundata. 
Corpus parallelum, antrorsum angustatum, pedibus mediocrlbus. 
The thorax is narrowed in front, with the posterior angles acutely produced. The 
mesosternum is plane, and triangular, and the tibial spurs are placed at the apex. 
