686 BYRRHIDZ. 
the colour becoming sometimes piceous instead of black. I am not sure, indeed, that 
there may not be two or three very closely allied forms amongst our specimens. The 
two most distinct are those I have named meaicanum and chontalense. The three 
specimens from Panama are very elongate, and have the punctuation somewhat 
effaced ; but they approach so nearly to some of the examples from Cerro de Plumas 
that I cannot at present consider them distinct. 
It is quite doubtful whether this is Castelnau’s species ; all he says is as follows:— 
“Brun obscur, couvert d’une pubescence grise, finement ponctué; corselet demi- 
orbiculaire, trés relevé en avant, guilloché au bord postérieur; dessous du corps d’un 
brun rouge. Mexique. Long. 24 lig., lat. 14 lig.” 
This does not appear to point to our insect, which is the most glabrous of the genus; 
possibly it may have been taken from the var. mexicanum, though I think this 
extremely uncertain. All the specimens named C. mexicanum in Sallé’s collection 
belong to this species, which is probably the form intended by Chevrolat. Under these 
circumstances I am not prepared to assign the name “ mexicanum ” to any other of our 
forms. The matter must remain uncertain until Castelnau’s type can be examined *. 
2. Chelonarium zapotense, sp.n. (Tab. XX. figg. 7; 7a, punctures of elytra.) 
Ovale, sat nitidum, ferrugineum vel piceum, parce subtiliter punctatum; elytris setis distantibus, elongatis, 
depressis yestitis ; puncto singulo geminato, e puncto minuto et puncto minimo composito. 
Long. 53-64, lat. 3-3} millim. 
Hab. Mexico, Ventanas (forrer), Tuxtla, Playa Vicente, Panistlahuaca (Sallé), 
Cerro de Plumas, Jalapa, Tapachula (Hége); GuatTEMaua, Zapote, San Gerdénimo, 
Panzos (Champion). 
Easily recognizable by the scanty, depressed, fine hairs on the elytra, each hair being 
about as long as the interval between the punctures; the punctures are extremely fine, 
and when highly magnified each one is seen to consist of a small puncture and a 
second extremely minute puncture imperfectly separated from the larger one. (In 
some allied species the two punctures are separated, but remain a pair.) The head is 
coarsely and densely punctured. The thorax has a rather broad band of punctuation 
round the front part, the disc is only very scantily and obsoletely punctured, and the 
sete in the punctures are so minute that they can only be detected under a high 
power. The punctuation of the under surface is not dense, and the sete are very 
short, though quite visible. Thirty-four specimens. 
One individual from Zapote is of much narrower form, resembling in this respect 
C. succinctum ; it may represent a distinct species. 
* Some of Castelnau’s specimens of Chelonarium came into my possession many years ago; amongst them 
is an individual labelled “ C. mexicanum, Dej., Mexico.” This is certainly not the type, and also does not 
agree with the description ; it appears to be nearer to C. errans. If the examples in Dejean’s collection can 
be found, they may throw some light on the subject. 
