168 LE CONTE.— LONGICORN COLEOPTERA 



3. M. APPRESSUM, nigrum, thorace lateribus non spinosis, antice posticeque parce punctatis, elytris ante 

 medium parce punetatis, dorso antice planis, lateribus subito valde declivibus. Long. -97. 



New Mexico, Dr. Wislizenus; the flattened elytra, with suddenly deflexed broad 

 epipleurse give this species somewhat the appearance of certain Eleodes. 



Group 16. 

 The series of Lamise with round anterior acetabula here commences with short 

 thick forms, resembling very much in appearance Mesosa, but with the head much 

 more distinctly narrower than the thorax, the front is short and a little concave 

 between the eyes; the anterior legs are not elongated, and the anterior tibise have 

 two very indistinct terminal spurs; other species are more elongate and depressed, 

 but otherwise present the same characters. In this group, when the sides of the 

 the thorax are armed the spine is placed behind the middle, and is directed obliquely 

 backwards : the first joint of the antennse appears to be always long and slender. 



LErTOSTYLUS. 



AntennjE minime pilosse, articulo 1™° elongate, cylindrico. 

 CoxEB anticae et intermediae distantes ; mesosterno truncate. 

 Tarsi postici articulo l""" vix longiore. 



I have formed this genus from species placed by Dejean and Haldeman in Amniscus, 

 from the following genera of this group these insects differ by the shortness of the 

 basal joint of the posterior tarsi. The appearance is that of Mesosa : the thorax is 

 tuberculous on the disc, and more or less prominent on the sides; the elytra are very 

 slightly truncate at the tip. 



1. L. ACULiFERUS, fuscus, dense cinereo-pubescens, thorace tuberculis 5 elevatis, postice modice constricto 



et punctato, eljtris crislis interruptis, punctisque elevatis postice reflexis, fasco varicgatis, lateribus 



ante medium fasciaque antice concava pone medium infuscatis. Long. -3 — -i. 

 Lamia acidi/era Say. J. Ac. Nat Sc. 3, 329. 

 Amniscus aculifcrus Hald. 47. 

 Amniscus marginelhis Hald. 47. 

 Amniscus albescens Hald. 46. 



A very varying species, found in every part of the United States; some of the 

 specimens have the ground color of the elytra yellowish with only the anterior margin 

 of the fascia white; others have the whole anterior portion of the elytra whitish, 

 with small fuscous dots; some of the specimens (females?) are broader than others. 

 The aiitennse and feet are mottled with fuscous and annulated with black. 



2. L. ALBiDUS, densissime albo-pubescens, parce albo-pilosus, ochraceo obsolete variegatus, tborace 5-tubercu- 



lato, lateribus antice rcetis, pone medium subito constricto, angulo laterali acuto, elytris lineis tribus 

 minus elevatis, piinctis parvis acutis piliferis interruptis, macula magna apicali lateribusque leviter 

 infuscatis. Long. '34. 

 One specimen from the Junction of the Colorado and Gila. The acute lateral 



tubercle of the thorax, and the scattered white erect hairs are sufficient to distinguish 



this from the next species, to which it is closely allied, 



