CRYPTARCHA. 383 
21. Cryptarcha imbellis, sp. n. 
Ovalis, convexa, sublevigata, nitida, ferruginea, pectore nigricante, elytris subtiliter subseriatim punctatis. 
Long. 3 millim. 
Hab. Guarema.a, Calderas, San Gerénimo (Champion). 
Antenne with the club clear yellow, elongate. Head small, moderately coarsely punc- 
tate, the sides deeply concavely curvate. ‘Thorax large, shining, finely and sparingly, 
but distinctly punctured. Elytra finely and distantly punctate, without pubescence, 
the punctures seriate, but not very distinctly so, and exhibiting little difference between 
those of the series and those of the interstices. Pygidium exposed, rather coarsely and 
sparingly punctured. Under surface somewhat coarsely punctate, finely but quite dis- 
tinctly pubescent. 
Mr. Champion procured a small series exhibiting no variation at Calderas; at San 
Gerdnimo only one specimen was obtained. 
22. Cryptarcha costaricensis, sp. n. 
Oblongo-ovalis, convexa, nitida, testacea, pectore fuscescente ; prothorace nitido, parce obsoleteque punctato ; 
elytris subtilius punctulatis. 
Long. 24 millim. 
Hab. Costa Rica, Volcan de Irazu 7000 feet (Rogers). 
Head rather coarsely punctate, quite shining. ‘Thorax very shining, sparingly and 
extremely finely punctate. Elytra with series of exceedingly fine punctures, and between 
them with an interstitial punctuation differing but little from the serial punctuation. 
Under surface rather finely punctate, with but little pubescence. 
Though closely allied to 0. iméellis this insect is easily distinguished by the more 
pallid colour, and by the finer punctuation of the upper surface. 
23. Cryptarcha atomaria, sp.n. (Tab. XII. fig. 16.) 
Oblongo-ovalis, convexa, testacea, levigata, minus nitida, subtilius parciusque punctulata. 
Long. 2 millim. 
Hab. Payama, Volcan de Chiriqui (Champion). 
This species is distinguished from C. costaricensis and C. imbellis, not only by its 
smaller size, but also by the peculiar dull surface. Antenne clear yellow. Head rather 
coarsely punctate, quite dull. Thorax with a distant and very minute punctuation ; the 
surface quite dull. Elytra quite dull, with numerous series of very fine punctures, 
without interstitial punctuation. Under surface ferruginous, quite sparingly punctate. 
Two specimens. 
Aberrant species, subdepressed and unusually elongate, with more imperfect articulation 
between the prosternal process and mesosternum : the former of these smaller than 
usual, 
