286 REVISION OF THE TENEBKK tXIH.E OF AMERICA, 



A. muricatula, Pelecyph. I Ann. Lye. 5 129. Philolithus muricatulus, Lac. Genres V.; 158. 



Closely resembling the preceding in outline and structure <>!' thorax, both have the 

 margin rather acute and slightly reflexed. There is no other than the marginal costa. 

 The elytra an' covered rather sparsely with erect short yellow hairs. The legs are not 

 hairy. Found at San Diego by Dr. Leconte, and at Los A.ngelos by Mr. Gabb. 



Length .45 inch. 



A. birsuta, Pelecyph.) Lee, Ann. Lye. 5-127. Philolithus hirsutus, Lac. Genres V., 158. 



Similar in outline to parallela. Thorax with an acute margin. Sides of elytra rounded. 

 without marginal costa. The whole surface is clothed with erect yellowish-white pubes- 

 cence. The Legs are also hairy. 



Found in the Colorado desert. Length .60 inch. 



A. hispidula, (Pelecyph.) Lee, Ann. Lye. 5-127. 

 Philolithus hispidulus, Lac. Genres V., 1 ~' s - 



Marginal line of elytra obtuse, elytra regularly oval, humeri rounded. Thorax broader 

 than long, sides rounded ; anteriorly emarginate with acute angles, base truncate, angles 

 distinct, not prominent. Surface sparsely clothed with very short hairs. Color usually 

 dark brown. Found in Colorado and Maricopa deserts. 



Length .50 inch. 



A. luctata, black, opaque, elongate oval. Head very sparsely punctured. Thorax one-third broader than 

 long, rather widely and acutely margined, disc very feebly convex, sparsely punctured at middle, more coarselj and 

 densely at tin- margin, si.Ics strongly rounded, sub-angulate al middle, ;ii»'\ deeply emarginate, angles acute and 

 prominent, .base bisinuate, angles obtuse. Elytra elongate oval, without marginal costa, humeral angles rouni 

 urface very faintly sub-tricostate. Presternum tinman-. Length .OS inch. 



I place this species near angulatus, from the similarity in outline, particularly of the 

 thorax, and from the absence of any elytral marginal ridge. It is, however, very distinct 

 from any of our species, In the characters given. 

 Occurs very rarely in Owens' Valley, Cal. 



A. angulata, Pelecyph.) Lee., Ann. Lye. 5-127. Philolithus angulatus, Lac. Genres 5 158, pi. -V. Sg. 3. 



Found heretofore only at San Diego, Cal. 

 Length 1.1 inch. 



A. lecontei, Horn, Proc. Ent. Soc. Sept. loth. 1866, verbal remarks. 

 Pelecyph. costipennia | Lee., Proc. Aral. 1839, p. 76. 



The thorax of this species is much broader than long-, with the sides evenly rounded 

 and with acute margins. The elytra are elongate oval, frequently (especially in %) sub- 

 parallel and with the shirs nearlj vertical. Each elytron has two distinct costa- between 

 the marginal and sutural. In some broadly oval ? ? there is a third costa between the 

 marginal ridge and the first dorsal casta. The species is, however, very variable. A va- 



