110 LONGICORNIA. 
and consisting chiefly in the great elongation of the outer apical angles of the elytra and 
the consequent gradual slope of the elytral surface near the apex. The mesosternum 
is nearly plane, and the prosternum very gradually and slightly arched between the 
anterior cox. I fail to see the character, mentioned by Lacordaire, of completely 
divided eyes, the two lobes of these organs being connected by a narrow thread as in 
the majority of the species of Adetus. The genus is peculiar to Mexico and Central 
America. 
1. Pterichthya pisciformis. 
Pterichthya pisciformis, Thomson, loc. cit. p. 1571. 
Hab. Mexico}, Puebla (Sallé); Guatemata (Sallé). 
A Guatemala specimen in M. Sallé’s collection has the apical prolongation of the elytra 
still longer than it is in Mexican examples. 
2. Pterichthya longicauda. 
Pt. pisciformi major, elytris apice maxime elongatis acutis, angulo suturali yelut denticulo intus longe ante 
apicem sito. Supra fusco-snea, nitida, vitta laterali fulva utrinque a vertice usque ad elytri medium 
(ibique curvata), linea obliqua post medium et elytrorum lateribus suffuse fulvis; antennis brevissimis, 
articulis 3° et 4° fulvis, hoc apice et 5°-11™ nigris; capite thoraceque sparsissime haud profunde punctulatis ; 
corpore subtus fulvo, medio nigro nitido, vitta laterali ab oculi margine inferiore usque ad coxas posticas 
densius fulvo-tomentosa. . 
Long. 53 lin. 
Hab. Mexico, Toxpam, Cordova (Sa//é). 
The peculiar fish-like form and elongation of the apices of the elytra, which distin- 
guish this genus, is carried to a greater extreme in this than in the preceding species. 
It is distinguished also by its extremely fine and scattered punctuation and shining brassy 
ground-colour. 
3. Pterichthya furculicauda. (Tab. VIII. fig. 6.) 
Angusta, ochraceo-fusea, thorace vittis tribus, elytris utrinque vittulis obliquis tribus (una laterali minus dis- 
tincta ante medium, secunda curvata pone medium tertiaque prope apicem) ochraceo-albis; capite thorace- 
que minus erebre grosse punctatis ; elytris punctis oblongis seriatim ordinatis, his apice extus in dentem 
prolongatis, angulo suturali spina arcuata, declivitate posteriore grossissime punctata. 
Long. 3-33 lin. 
Hab. Guatemata, Duefias, Capetillo (Champion), Aceytuno, 5100 feet (Salvin). 
The exterior angle of the apex of the elytra is much less elongated than in P. pisct- 
formis; but the sutural angle is armed with a sharp spine just as in that species. 
P. furculicauda bears a close general resemblance to Adetus leucostigma, and, in short, 
bridges over the difference between the two genera. The postmedian and subapical 
stripes sometimes meet, as represented in our figure, in which it must be remarked the 
artist has not successfully represented the general colour of the insect. 
