CHOEKIDIUM. 45 



C. illcesum in very little except size and colour ; the central carina of the pygidium is 

 very faint, and visible only in certain lights, or in some female examples quite obsolete. 

 In well-developed individuals the pygidium, under a lens, appears finely and sparsely 

 punctured. 



3. Clioeridium klugi. 



Chceridium klugi, Harold, Col. Hefte, iv. p. 56 1 . 



? Chceridium nitidulum, Casteln. Hist. Nat. Ins. Col. ii. p. 83 2 . 



Hob. Mexico x 2 , Cordova (Salle). 



Von Harold gives the size as 3 j-4 lines, but a specimen I received from him named 

 C. klugi measures barely 3 lines ; the size given by Castelnau for C. nitidulum, viz. 

 2-f lines, is therefore no reason for excluding his species from the synonymy, though his 

 description is too vague to be relied on. Specimens named C. nitidulum, Casteln., in 

 the Salle collection measure 2^ and 3 lines, and agree with Von Harold's named example 

 and with his description. The form is oblong, as in G. illcesum, and the pygidium is 

 only a very little more convex than in that species, with which the minutely punctured 

 bases of the ventral segments also agree. The species is barely distinguishable by its 

 rather more convex elytral interstices, deeper and more strongly crenated stria?, and 

 strongly impressed dorsal lines of the thorax, the base of which is very finely margined. 



4. Chceridium guatemalense. (Tab. II. fig. 24*.) 



G. Tdngi quam maxime afflne ; differt pygidio valde convexo thoraceque toto haud profunde punctate Oblongum, 

 nigrum, nitidum, leviter metallicum ; thorace toto, versus basin grossius, puuctulato, linea dorsali postiee 

 impressa, medio basi depresso : elytris lateribus vix rotundatis, perspioue crenato-striatis, interstitiis leviter 

 (prsecipue versus latera) convexis ; pygidio valde convexo, lasvissimo, sulco profundo marginato : segmentis 

 ventralibus basi parum punctatis, apicali lato et laevi metallico. 



Long. 5g-7| millim. 



Hab. Guatemala, El Tumbador, Volcan de Atitlan, Pantaleon (Champion). 



The sexual characters are the same as in C. illcesum. The punctuation of the thorax 

 is as well marked as in C. capistratum, and a little stronger in the female than in the 

 male. 



Taken by Mr. Champion in great abundance. 



The elytral striae, as in all other species of the C. capistratum group, are deepened 

 and broadened towards the apex, before which they terminate. The base of the thorax 

 appears to be immarginate, but on close inspection a narrow line is in some examples 

 seen at a little lower level than the apparent base. 



5. Chceridium ampliation. (Tab. II. fig. 25.) 



Latius ovatum, sed elytris multo minus quam in G. capistrato ampliatis. Nigrum, nitidum, viridi-seneo vel 

 * By an oversight the name of the genus is given as Ghceridium on the Plate. 



