— 
Species of Agra of the Amazons Region. 367 
stitiis glabris, elevatis ; elytris regulariter lineatim foveolatis, 
apice oblique flexuoso-truncatis, angulis suturalibus pro- 
ductis; tarsis elongatis, fulvo-hirsutis. 
$ Mesosterno et segmentis ventralibus (apicali excepto) punc- 
tatis et longe fulvo-hirsutis ; femoribus crassis, tibiis inter- 
mediis intus pone medium unco armatis, posticis medio 
angulatis et intus dente instructis, pone medium intus hir- 
sutis ; tarsis haud dilatatis. 
® Pedibus teretibus, mesosterno abdomineque glabris ; antennis 
articulo 8° valde abbreviato. 
Long. 11—13 lin. 
This is the largest known species of the genus, and is at once 
distinguishable from its nearest relatives by the quadrate shape of 
the head in both sexes. I met with it only at Ega, where it 
occurred sparingly on leaves of trees in the forest. Baron 
Chaudoir was unacquainted with the true male at the date of his 
monograph quoted above, and described that sex of an allied 
species, our 4. anguinea, as the male of 4. Megera. 
6. Agra anguinea, vn. sp. (Pl. XX. fig. 6, $.) 
A. Megere forma et colore simillima, sed minor; capite multo 
angustiori, haud quadrato, parte postica quam thoracis apice 
vix latiori, pone oculos leviter attenuato ; thorace medio 
paulo dilatato. 
$ Trochanteribus posticis segmentisque ventralibus medio 
dense, mesosterno medio sparsim, punctatis et pilosis ; tibiis 
intermediis prope apicem intus dentatis; posticis a medio 
usque ad apicem intus incrassatis et pilosis; femoribus 
validioribus. 
@ Pedibus teretibus ; antennis articulo 8"° valde abbreviato. 
Long. 103—11 lin. 
Found also at Ega, in the same situation as 4. Megera. The 
great differences in secondary sexual features between the males 
of this form and of 4. Megera forbid their being classed as be- 
longing to the same species; for it has been generally allowed 
by attentive students that these characters offer the best guides 
in distinguishing species, and they may well be so considered, 
since marked sexual differences afford strong presumption of the 
non-existence of intercrossing, the surest indication of persistent 
separation between closely-allied forms. I should not, however, be 
surprised at intermediate forms of the male sex being found between 
A, Megera and A. anguinea, or any other similarly-related species. 
