684 BYRRHIDZ. 
I do not think this is the Ersachus described by Erichson; all that he says about 
his species is ‘“rufo-piceus, pube brevissima densa maculatim aureo cinereoque 
variegatus; elytris punctatis. Long. 14 lin. Von Moritz in Columbien entdeckt.” 
2. Ersachus lugubris, sp. n. 
Minus latus, niger, pube grisea maculatim vestitus, antennis pedibusque testaceis; parce, irregulariter 
punctatus. 
Long. 23, lat. 1 millim. 
Hab. GuaTEeMata, Cerro Zunil (Champion). 
Closely allied to E. erichsonianus, but distinguishable by the blacker colour and 
narrower form. The specimens—four in number—are in a very bad state of preservation, 
but I have little doubt as to the distinctness of the species. 
3. Ersachus mexicanus, sp. n. 
Brevis, rufescens, tomento minutissimo griseo maculatim vestitus, antennis pedibusque testaceis ; prothorace 
medio supra caput valde gibboso. 
Long. capite extenso 2, lat. 1,5 millim. 
Hab. Mexico, Atoyac in Vera Cruz (H. H. Smith). 
Very similar to E. erichsonianus, but of shorter form, and separable therefrom by the 
great gibbosity of the middle of the prothorax, which seen from the front forms a sort 
of knob, which is very densely punctate. One specimen. 
Subfam. CHELONARIIN. 
The position of the curious beetles that form the genus Chelonarium is by no means 
clear. Erichson did not allude to the genus in his notice of the Byrrhide in the 
third volume of the ‘ Insecten Deutschlands,’ from which we may infer that he did 
not consider it to belong to this family. By the early authors Chelonarium was placed 
in Throscide. In the Munich Catalogue it is placed in Byrrhide, but on what grounds 
I do not know. It appears to me to be more allied to Dascillide than to any other 
Coleoptera. The limits of the families Byrrhide, Parnide, and Dascillide are at 
present merely conventional, and as they will probably be united, it is not necessary to 
further discuss the position of Chelonarium. 
CHELONARIUM. 
Chelonarium, Fabricius, Syst. Eleuth. i. p. 101 (1801). 
This genus consists of about twenty-five species, most of which are found in the tropical 
regions of the New World. A few forms are recorded from the Eastern Hemisphere, 
but I have never seen any of them. These insects are most difficult to study. No 
structural characters are available for their discrimination, and it is necessary to rely 
on the slight peculiarities afforded by shape, size, and the nature of the surface. The 
