82 ADEPHAGA. 
This species is remarkable from the diminished punctuation of the upper surface and 
the comparatively slender elongate antenne. ‘The unique individual is no doubt a 
female, although it has the front and middle tarsi broad. The thorax at the base is 
quite as broad as the elytra, so that the outline is perfectly continuous; the hind angles 
are well marked and rectangular; its surface is very polished and shining; the anterior 
series of punctures, however, are distinct, although the basal series is obsolete. 
4, Celina debilis. 
‘Suboblonga, angustula, nitida, glabra, rufo-testacea ; elytris parce subtiliter punctatis, serie discoidali distincta ; 
antennis parum elongatis ; coxis posterioribus externe subobsolete rugoso-punctatis. 
Long. 14, lat. 3 lin. 
Hab. GuateMata, Paso Antonio, 400 feet (Champion). 
This species is remarkable from its small size and scanty punctuation. The male 
front tarsi are scarcely at all dilated, and the tibiz are simple; the intermediate tibie 
in this sex are curvate and notched inwardly above the middle, with a minute tooth 
above the notch. There is only a very slight sexual difference in the length of the 
antenne, these organs being just perceptibly longer in the male. 
C. debilis is allied to C. angustata, Aubé, with which I have no opportunity of 
comparing it; but it is no doubt smaller, with the male front feet less dilated. 
AGABUS. 
Agabus, Leach, Zool. Mise. iii. pp. 69, 72 (1817); Sharp, Trans. Roy. Dubl. Soc. n. s. ii. p. 876. 
This is an extensive genus of fully one hundred species, inhabiting chiefly the northern 
portions of the Nearctic and Palearctic regions, where they ascend to high latitudes. 
Mexico thus appears to be the extreme extension of the genus southwards in the New 
World. 
1. Agabus spinipes. 
Ovalis, parum convexus, subnitidus, niger, supra subsenescens, antennis palpisque rufis, pedibus piceo-rufis ; 
elytris densissime reticulatis, punctis subseriatis sat conspicuis; antennis palpisque crassiusculis ; pedibus 
omnibus crebrius spinulosis ; corpore subtus sublevigato ; prosterni processu basi crasse marginato ; coxis 
posticis parvis. 
Long. 3, lat. 12 lin. 
Hab. Mexico, Oaxaca (Hége). 
This is a peculiar and very distinct species, not nearly allied to any other known, but 
possibly approaching the peculiar Californian Hydrotrupes palpalis. The prothorax is 
a little narrower than the elytra, but little curved at the sides, the hind angles obtuse, 
the lateral margin strongly elevated but not broad. Elytra very finely and densely 
reticulate, so as to be but little shining, with the usual subserial punctures large but 
not distinct. Under surface with only very fine and obsolete sculpture; the anterior 
