194 Mr. J. O. Westwood’s Monograph 
the inner margin, are characters which at once distinguish it from 
every other genus in the family. 
The only species is, from the last-named .character, named 
Merope tuber, Newman. Ent. Mag. v. 180. 
(Pl. XIV. fig. 2.) 
Fuscescens, antennis, capite et prothorace saturatioribus ; abdo- 
mine pedibus, alisque dilutioribus, oculis nigris. 
Corp. long. ‘35 unc. Alar. expans. 1°05 unc. 
Habitat Trenton Fails, N. Amer. D. Doubleday. 
{ Mus, Britann. | 
DESCRIPTION OF THE FIGURES. 
2, the insect of the natural size; 2a, the same magnified; 2b, the head in 
front; 2¢, the head and thorax sideways ; 2d, mandible; 2e, maxilla; 
2f and 2g, maxillary lobes; 2h, maxillary palpus; 2i, labium; 2k, 
antenna ; 2/, apex of body. 
Genus Bitracus, Latreille. 
Sp. 1. Bitlacus affinis, Westw. 
Testaceus, abdominis apice tarsisque posticis obscurioribus, alis 
pallide fuscescentibus, stigmate fusco, venisque parum fusco 
tinctis. 
Long. corp. lin. 9. Expans. alar. lin, 194. 
Habitat in Brasilia. In Mus. Britann. 
Antenne gracillime, apice obscuriores. Mesothorax lobis late- 
ralibus dorsi puncto medio nigro. Abdomen segmentis basali- 
bus ad apicem cingulo tenuissimo nigro, apiceque incrassato 
obscuro. Ale pallide fuscescentes, stigmate (cum cellula 
sequenti) quam in B. ztalico paullo longiore fusco ; apiceque 
alarum fusco paullo obscurius tincto; venis nigricantibus 
fusco nonnihil nebulosis, praesertim ad basin venarum longi- 
tudinalium et in venis lineam obliquam pone medium ale for- 
mantibus. Costa cum vena mediastina, vend brevi transversa 
in ale medio, connexa; apiceque venze mediastine cum v. 
postcostali, vena obliqua connexa; stigmate postice venam 
unicam emittente; vena ramos posticos vene postcostalis 
conjungente, valde obliqua, et fere e basi rami inferioris 
emissa. 
B, italico minor, alis magis coloratis. 
B. brasiliensi etiam affinis, differt tamen stigmate fusco, &c. 
