792 SUPPLEMENT. 
typical species; and the two median lobes of the labrum are slightly emarginate, so that 
the front of the labrum exhibits six slight projections. 
CRYPTOBIUM (p. 506). 
Cryptobium collare (p. 507). 
Var. Prothorace nigro, parcius punctato. 
Hab. Mexico, La Noria in Sinaloa (/ége). 
The small series procured of this variety agree rather closely inter se, but can scarcely 
be regarded as representing a distinct species without more evidence. 
Cryptobium luridum (p. 512). 
To the Mexican localities given, add:—La Noria in Sinaloa, Tehuantepec (Hége). 
12 (a). Cryptobium sedatum. 
Piceo-ferrugineum, antennis rufis, pedibus dilutis; capite subopaco, dense profunde punctato; prothorace 
crebrius punctato, medio longitudinaliter levigato, lateribus subrotundatis; elytris densius, profunde 
fortiterque punctatis, subrugosis. 
Long. 12 millim. 
Hab. Mexico, La Noria in Sinaloa (Hége). 
Though very similar to C. /uridum and its immediate allies this species will be easily 
distinguished by a slight difference in the shape of the thorax, the sides being a little 
rounded and narrowed towards the front ; the head is shining in front, and the punc- 
tuation of the thorax is closer than in the species mentioned. Only two examples have 
been obtained ; they are of the female sex, and are without positive sexual marks. 
12 (8). Cryptobium placidum. 
Ferrugineum, pedibus testaceis ; capite subnitido, dense, profunde punctato ; prothorace crebre punctato, medio 
late longitudinaliter levigato ; elytris crebre fortiter punctatis. 
Long. 13 millim. 
Hab. Mexico, Zacualtipan in Hidalgo, Aguas Calientes city (Hége). 
This insect resembles C. /uridum in colour and appearance, but the surface of the 
head is shining: this is very evident in front, where the punctuation is absent; but 
on the vertex, where the punctuation is very dense, it is, of course, less conspicuous. 
The punctuation of the elytra is also rather coarser than in the species similar to this in 
colour. C. placidum is more nearly related to C. sedatum, but the head is rather more 
coarsely and less densely punctured ; the thorax is very much more sparingly punctured, 
and the rounding of the sides at the front angles scarcely evident; and the elytra are 
shorter and more coarsely punctate. ‘The male has an elongate setigerous line on the 
third ventral plate ; the following plate is produced so as to form a long broad lobe, 
and also bears a small, elliptical, setigerous fovea. 
