398 . TROGOSITIDZ. 
T. chalcea is in several characters intermediate between T. chevrolati and T. quadri- 
collis; this is the case as regards the general form, the punctuation of the head, the 
proportions of the thorax, and the acuteness of the humeral angle of the elytra. The 
female of 7. chalcea may, however, be immediately recognized by the remarkably deep 
and definite depression on the last ventral segment. The male is not easy to discriminate 
at first sight from the two species mentioned; but 7. chalcea nevertheless presents a 
slight peculiarity in the punctuation of the elytra in both sexes, which, after it has once 
been recognized, enables its individuals to be separated with ease from those of the 
allied species. This consists in the fact that whereas in 7. chevrolati and T. quadri- 
collis there is but little difference between the punctuation of the interstices and the 
striee, both being serial and of nearly equal coarseness, in 7. chalcea, on the other 
hand, there is a strongly marked difference in this respect, owing to the punctuation of 
the interstices being much reduced ; indeed in extreme cases it is almost entirely absent, 
and the elytra bear only widely separated series of punctures. 
In the female of 7. chalcea there is but little difference between the size of the 
punctures on the submental area and on the mentum. 
T. chalcea appears to be an abundant species throughout our region from Central 
Mexico southwards, and is probably equally common in the northern parts of South 
America. The exponents of the species in Sallé’s collection are labelled 7. guadricollts, 
Reitter; and it is indeed far from impossible that if the type example of Reitter’s 
species can be examined it may prove to belong to this and not to the preceding species. 
Group C.—Prothorax with moderately stout lateral margin. Prosternum very coarsely 
punctate at the apex, but without margin. Mandibles short. (Species 7.) 
7. Temnochila geminata, sp. n. 
Sat lata et convexa, nigro-senescens, supra aureo-enea, antennis piceis, articulo basali anterius znescente ; capite 
parce punctato; prothorace sparsim fortiter punctato, punctis ante scutellum ad basin utrinque magis 
confertis ; clytris subtiliter et remote seriatim punctatis, interstitiis fere sicut seriebus punctatis. 
Long. 13-15 millim. 
Mas, area submentali parce punctata et pubescente, medio fasciculo magno armata; segmentis ventralibus 
punctis adjectis parcis et subtilibus, parum conspicuis. 
Fem., abdomine segmento ultimo ventrali in medio ad apicem profunde impresso. 
Hab. Panama, Bugaba, Volcan de Chiriqui 2000 to 4000 feet (Champzow). 
This species is remarkable by the very coarse punctuation of the middle of the 
prosternum behind the cox; in front of the coxe the punctuation also is unusually 
coarse on each side. TZ. geminata is similar in size and form to 7’. chalcea, but is very 
different in the punctuation of the thorax and elytra, and no trace can be seen of the 
prosternal margin behind the coxz. It is more nearly allied to the Demeraran 7’. fovei- 
collis, Reitter ; but that species has the serial punctures on the elytra remarkably © 
distinct, while the interstitial punctures are even finer than they are in 7’. geminata, 
