58 HETEROMERA. 
17. Asida laticollis. (Tab. III. fig. 7.) : 
Oblong oval, rather convex, dull black, densely clothed with brown scaly hairs. Head transversely me ie 
in front; prothorax finely and very densely punctured, rugulose, with a smooth indistinct centra raised 
line, broad, transverse, rounded at the sides, very feebly sinuate and scarcely narrowed behind, hind angles 
produced, prominent, straight, and overlapping the elytra, narrowed in front, the anterior angles prominent 
and obtuse, base feebly bisinuate and subtruncate in middle; elytra as wide as or a little wider than the 
thorax at the base, rounded at the sides, broadest about the middle, humeral angles obtuse, with three 
fine ridges—the first two confluent behind, the third not reaching the base, and a marginal ridge 
confluent just before the apex with the united first and second, the suture raised and prominent, the two 
outer dorsal and the marginal ridges sometimes connected by one or two transverse raised lines, the 
interstices with matted dark-brown scaly hairs and in the centre of each a darker line dividing the lighter 
scales into two rows; anterior tibie with a sharp tooth at outer apical angle ; scutellum with a central 
keel. Beneath finely and closely punctured ; prosternum produced behind and rounded, subhorizontal. 
Length 17-18 millim. 
Hab. Mexico (coll. F. Bates), Guanajuato (Salle). 
Four examples. Closely allied to A. fallax, from which it differs in being larger, 
broader, and longer, the thorax broader and more strongly transverse, more finely 
and closely punctured, with the hind angles straighter and more produced, and the base 
straighter; the head smoother, the antenne a little shorter, &c. 
18. Asida favosa. 
Oblong oval, rather convex, dull black, clothed with dark-brown scaly hairs. Head broad, transversely 
impressed in front, finely and sparingly punctured ; prothorax finely and very densely punctured, rugulose, 
with a smooth shining central raised line, transverse, narrowed and feebly sinuate behind, hind angles 
produced, prominent, and overlapping the elytra, narrowed in front with the angles prominent but not 
acute, base bisinuate and the central lobe a little produced and subtruncate; elytra broader than the 
thorax at the base, sides rounded, somewhat dilated from the base to a little beyond the middle, humeral 
angles a little raised and obtuse, with three smooth fine interrupted ridges (the outer not reaching the base) 
and a sharp marginal ridge, these ridges unite before the apex and are more or less connected by a few raised 
transverse lines, the suture raised and smooth, the interstices densely clothed with dark brown scales; 
anterior tibie truncated at apex, bluntly toothed at outer apical angle; scutellum with a central keel; 
antenn rather stout, intermediate joints scarcely longer than broad. Beneath slightly shining, ventral 
segments sparingly and finely punctured; prosternum prominent behind, rounded at apex, subhorizontal. 
Length 17 millim. ( @.) 
Hab. Mexico, Guanajuato (Sal/é). 
One example. Closely resembling A. /aticollis and A. fallax, and perhaps a variety 
of the latter. 
19. Asida similata. 
Oblong ovate, rather convex, dull black, clothed with dark-brown scales. Head transversely impressed in 
front; prothorax rugulose, somewhat coarsely, closely, and irregularly punctured, with a smooth central 
raised line, lateral margins rather strongly rounded, a little swollen and reflexed, and sinuate and narrowed 
behind, hind angles produced, outwardly directed, and overlapping the elytra, narrowed and rounded 
towards the front, the anterior angles prominent and rounded, base bisinuate, the central lobe subtruncate; 
elytra a little broader than the thorax at the base, strongly rounded at the sides, widest about the middle, 
humeral angles obtuse and hidden by the hind angles of the thorax, with three fine ridges (the outer not 
