88 LAMELLICOBMA. 



Costa Rican examples are a little darker in colour, and have more distinctly convex 

 elytral interstices than those from Mexico. The species resembles A. brasiliensis in 

 form and colour, and especially in the characteristic marking near the apex of the elytra ; 

 but it belongs, according to the received classifications of the genus, to quite a different 

 section : A. brasiliensis having equal apical setse to the hind tibiae and a trituberculate 

 head, the base of the thorax remaining, as in A. duplex, immarginate. It must be 

 observed that the inequality of the apical setse is not the same in A. duplex as in the 

 A. prodromns group, the long bristles are near the outside of the fringe and not sub- 

 alternately mingled with the short bristles. 



An example from Costa Hica is figured. 



18. Aphodius panamensis. (Tab. VI. fig. 16.) 



Aphodius panamensis, Harold, Berl. ent. Zeitschr. 1859, p. 212 \ 



Anguste-oblongus, glaber, politus, piceo-hiscus, capite tboracequo subsenescentibus, thoracis lateribus et macula 

 media basali elytrorumque margine et interstitio 2° luteo-testaceis ; capite fere la;vi, polito, clypeo sinuato 

 et utrinque rotundato, mediocriter convexo, genis angulatis sed parum prominentibus ; thorace disco 

 subtilissime sparsim, lateribus grossius et densius, insequaliter punctulato, angulis posticis omnino rotun- 

 datis ; elytris striatis, striis haud perspicue punctulatis, interstitiis fere planis, subtilissime alutaceis ; 

 pedibus gracilibus, sparsim longe setosis, tibiis posticis extus brevissime carinatis. Elytrorum strise l a -3 m 

 solum apice liberas, interstitia convexa. 



Long. 3|-4 millim. 



Hab. Panama 1 , Bugaba, David [Champion). 



When this insect is viewed from above, the base of the thorax appears immarginate ; 

 but from behind obliquely the extreme edse is seen, with a lens, to be very finely 

 margined. In profusion in horse-dung on open savannahs in the low country 

 (Champion). 



19. Aphodius guatemalensis. (Tab. VI. fig. 17.) 



Parvus, oblongus, mediocriter convexus, glaber, uitidus, piceo-niger, capite utrinque macula, tboracis angulis 

 anticis elytrisque vittis abbreviatis basalibus, macula bumerali alterisque prope apicem, fufvo-testaceis, 

 pedibus rufo-piceis ; capite inermi, medio parum tumido, toto regulariter subdeuse punctulato ; clypeo 

 antice subsinuatim truncato, lateribus leviter rotundatis, ante genas verticaliter arcuatis; tboraee disco 

 sparsim subtiliter, lateribus densius grossius, punctulato, basin versus angulo obliquo, angulis distinctis 

 parum obtusis ibique subtilissime marginato ; elytris subtiliter crenulato-striatis, interstitiis planissimis, 

 vix perspicue sparsim punctulatis ; antennis rufo-piceis, clava fusca ; pedibus posticis gracilibus, tarsis 

 articulo primo elongato. Elytrorum stria? 2 a -5 ra aequaliter distantes, 2 a paullo abbreviata, 3 a -5 m sequales ; 

 interstitia usque ad apicem plana. 



Long. 3-3| millim. 



Hab. Guatemala, Quiche Mountains, Quezaltenango, Duefias, San Geronimo, San 

 Joaquin, Balheu (Champion). Many examples. 



Belongs to a group of very small, closely allied species, which tend to form geogra- 

 phical varieties distinguished by colour and markings. Its chief characters are : — 

 (1) the finely impressed elytral striae, which are not squarely scored, but are simple lines 



