TENEBROIDES. 427 
in 7. repetitus, the male has the coarse punctuation of the ventral segments to a great 
extent replaced by fine subobsolete punctures. 
25. Tenebroides marginicollis, sp.n. (Tab. XIII. fig. 16.) 
Depressus, subparallelus, parum nitidus, piceus, limbo plus minusve distincte dilutiore ; prothoracis marginibus 
bene elevatis ; elytris seriatim punctatis, interstitiis obsolete punctatis. 
Long. 11 millim. 
Hab. Guatemaa, Capetillo, Duefias (Champion). 
In this species the surface has a peculiar appearance, somewhat as if slightly greasy. 
The head is rather large, not foveolate, moderately finely punctate. The thorax is but 
little rounded at the sides, slightly narrowed behind, the anterior angles much pro- 
duced, slender, the lateral margin rather strongly elevated, similar for all the length ; 
the surface punctate like the head; the lateral margins ferruginous, usually more 
broadly so at the front angles. Elytra depressed, scarcely striate, but with very distinct 
series of punctures, and very fine punctuation on the interstices. Ventral segments 
closely punctate. | 
Distinguished from all the varieties of 7. repetitus by the more parallel-sided thorax, 
the lateral margins of which are more strongly and evenly elevated. 
26. Tenebroides instabilis, sp. n. 
Parum elongatus, depressus, nitidus, niger, antennis pedibusque rufis ; prothorace basin versus sat angustato, 
minus sinuato, crebre subtiliter punctato; elytris subtiliter striatis, interstitiis subtilius biseriatim 
punctatis. 
Long. 6-7 millim. 
Hab. Muxico, Jalapa (Hoge), Cordova (Sallé). 
Head small, not shining, not densely punctate, the punctures smaller in front, the 
forehead not, or very indistinctly, foveate. Thorax strongly transverse, the lateral 
margins not coarse, the sides not much rounded, distinctly narrowed behind but not 
sinuate, the punctuation moderately dense, not coarse. lytra finely striate. 
This, too, appears to be a variable species. I have treated as the type of it four 
specimens found by Hoge at Jalapa with finely striate elytra; but the seven other 
examples have the elytra more deeply striate, though in a variable degree. 7. instabzlis 
appears, however, to be distinct from 7. harpaloides—to which it comes very near— 
by its considerably narrower head, the insect being in this respect similar to 7. rufo- 
limbatus. 
27. Tenebroides incertus. 
Tenebroides incertus, Léveillé, Ann. Soc. Ent. Fr. 1888, p. 423°. 
Hab. Mexico}. 
This species seems, from the description, to be allied to T. harpaloides and 
T. instabilis. 
3 1* 2 
