62 
beneath its apex, surmounted by a peneil of stiff hairs; the 
basal joint is as long as the third, gradually thickened from the 
base, and in both sexes toothed beneath at the apex. Thorax 
obtusely tuberculated on its disk, and with large conical lateral^ 
tubercles. Elytra very broad at the shoulders, gradually and 
slightly tapering to the apex, which latter is briefly truncated. 
Thighs abruptly clavate ; basal joint of the tarsi not much longer 
than the second. 
The females have not elongated ovipositors and sheaths ; the 
terminal abdominal segments, however, are much longer in the 
females than in the males. In one of the two species which I 
have examined [L, araneiformis) both the ventral and dorsal 
segments have their apical edges excised, whilst in the other (L. 
fasciculatus) they are entire. The males have their anterior tarsi 
ciliated. 
1. Lagocheirus araneiformis, Linnseus. 
Cerambyx araneiformis, Linn. Syst. Nat, ii. p. 625 ; Drury, Illustr. ii. 
t. 35. f. 4. 
Acanthoderes araneiformis, Serv. Ann. Soc. Ent. Fr. iv. p. 30. 
L. oblongus, postice modice attenuatus : thoracis tuberculis laterals 
bus acutis : elytris nigro fasciculatis, olivaceo-griseis, macula 
magna lateral! triangular! fusco-nigra lineisque transversis pallidis 
ornatis : tarsis articulis duobus basalibus griseis, duobus apicalibus 
nigris nitidis. Long. 7-1 1 lin. <5' $ . 
This is a well-known and widely distributed insect. I found 
it occasionally at most stations on the banks of the Amazons, 
from Para to Peru : it is also a native of Guiana, the West Indian 
Islands, and the Island of Tahiti, where, according to M.Vesco*, 
it is common, the larva inhabiting the trunks of Spondias dulcis. 
It is not stated whether the Tahitian examples differ from those 
of America; those of the West Indian Islands form a tolerably 
distinct local variety. The species, however, has probably been 
introduced by the agency of man into the distant Polynesian 
island. 
2. Lagocheirus fasciculatus, White. 
Try panidius fasciculatus. White, Cat. Long. Col. Brit. Mus. ii. p. 377» 
pi. 9. f. 9. 
L, oblongus, postice valde attenuatus : thoracis tuberculis lateralibus 
obtusis : elytris nigro fasciculatis, olivaceo-griseis, maculis duabus 
lateralibus triangularibus (altera magna, altera parva) fasciaque 
lata pallida ornatis : tarsis ochraceis, articulo ultimo apice nigro. 
Long. 8-9| lin. S $ • 
Not uncommon at Ega, Upper Amazons, on dead branches in 
the forest, in company with Acrocinus trochlearis and other wood- 
* Leon Fairmaire, Coleopteres de la Polynesie, p. 88. 
