170 ACADEMY OF NATURAL SCIENCES 



A fine large species, found in very considerable [304] num- 

 bers near Purgatory river of the Arkansa, called by Lieutenant 

 Pike the " First Fork." 



8. L. IMMACULATA. — Black, with cinereous hair; second joint 

 of the antennae as long as the third. 



Inhabits Arkansa. 



Body black, partially covered with short, prostrate, cinereous 

 hair : antennae, second joint as long as the third : palpi, beneath 

 the hair, reddish-brown : thorax with an impressed, longitudinal 

 line. 



Length four-fifths of an inch. 



9. L. ARTicuLARis. — Black with dense ferruginous hair ; se- 

 cond joint of the antennae as long as the third. 



Inhabits Arkansa. 



Body black, entirely concealed by dense, short, prostrate, 

 ferruginous hair : antennae subglabrous, half as long as the body ; 

 second joint equal to the third : palpi obscure reddish-brown ; 

 thorax with a longitudinal impressed line, not narrowed behind : 

 tibia with sparse hairs : tarsi with black hairs. 



Size of the preceding, to which it is very similar in form, and 

 of which it may very possibly be a variety. Found near the 

 Rocky Mountains. The color of the hair, with which the body 

 is covered, is very similar to that of L. ferruginea, but that 

 insect is very difi"erent in the proportional length of the an- 

 tennae. [305] 



10. L. ALBiDA. — [Ante, 1, 6. Having failed to identify this 

 species, I described it as L. luteicornis, Proc. Acad. Nat. Sc. 

 Phil. 7, 84.— Leg.] 



11. L. RETICULATA. — Black ; elytra reticulate with elevated 

 nervures. 



Inhabits Arkansa. 



Body black, obsoletely tinged with green, subglabrous, punc- 

 tured : head irregularly and confluently punctured : antennae 

 gradually more robust towards the tip : thorax somewhat rounded, 

 much narrowed before, punctures sparse before, confluent each 

 side and behind : elytra reticulate, with elevated nervures. 



Length about seven-tenths of an inch. 



[Yol. III. 



