80 
MONOGRAPH OF THE DORYLIDES. 
Species V.— Dorylus juvenculus, Shk. (Mon. Dor. p. 32). Rufo-fuscus, glaber, subatlenu- 
atus ; capite (antennis mandibulisque castaneis exceptis), et venis alarum nigris, vertice 
valde prominente, facie in medio sulcata, labro tuberculis binis instructo et pedunculo 
abdominis quadrato-convexo. Long. corp. lin. 15|. Expans. alar. lin. 24. 
Inhabits Barbary. 
Species VI.— Dorylus labialus, Shk. (Mon. Dor. p. 33). Pallide brunneus, scu’rufo-testaceus 
glaber, facie pilosa, subtuberculata, prominula, in medio profunde sulcata, mandibulis 
attcnuatis, labro tuberculis binis magnis instructo et pedunculo abdominis quadrato vel 
potius subgloboso. Long. corp. lin. 14T. Expans. alar. lin. 23. 
Inhabits Poonali and Assam. 
D.—Peduncle quadrate, mandibles broad and nearly triangular. 
Species VII.— Dorylus orient alls, Westwood. (Proc. Z. Soc. 1835, p. 72, Shk. Mon. Dor. 
p. 34). Helvoluspilosus, abdoraine glabro, capite rufo, facie in medio sulcata,mandibulis 
subtrigonis, vena cubitaii valde sinuosa, pleuris sericeis et pedunculo abdominis quadrato 
gibboso ; venis binis internis alarum posticarum venis duabus transversis convexis. Long, 
corp. lin. 12^. Expans. alar. lin. 19. 
Inhabits Bengal. 
Species VIII.— Dorylus longicornis, Shk. (Mon. Dor.p. 35). Helvolus subpubescens, capite 
nigro convexo, facie in medio sulcata, mandibulis subtrigonis, pleuris obscuris, vena 
cubitaii subrecta, petiolo abdominis quadrato gibboso. Long. corp. lin. 11|. Expans, 
alar. lin. 18. 
Inhabits Bengal. 
Species IX.— Dorylus attenuatus , Shk. (Mon. Dor. p. 36). Helvolus vel testaceus sub¬ 
pubescens, capite nigro vel rufo, facie in medio sulcata, mandibulis subtrigonis, venis 
alarum brunneis vel testaceis, pedunculo quadrato gibboso. Long. corp. lin 10|. Expans, 
alar. lin. 15. 
Supposed to inhabit the vicinity of the river Gambia. 
Species X.— Dorylus atriceps 9 Shk. (Mon. Dor. pi. 37.) Sordide helvolus, glaber, 
capite (antennis mandibulisque badiis exceptis) atro, facie valde prominente in medio 
subsulcata,pedunculo abdominis quadrato-gibboso. Long. corp. lin. 9Expans. alar. Iin.l5|. 
From the vicinity of the river Gambia. The mandibles are very broad, with a large obtuse 
triangular projection at the base within, leaving no space between them when closed, their 
inner edge acute. 
Rhogmus, Shk. 
This group lias been proposed as a genus by Mr. Shuckard, for 
the reception of a species which differs from the other Doryli, by 
possessing two recurrent veins in the fore wings, which have only 
two submarginal cells ; the mandibles are triangular, the feet very 
short with the thighs broad and compressed, and the abdomen very 
long and clavate. From the irregularities which so frequently occur 
in the position of the veins of the wings of the other Doryli, I 
consider that the first of these characters, which Mr. Shuckard con¬ 
siders as of primary importance and employs in his synoptic table, 
of too trivial a nature to warrant the generic separation of Rhogmus 
from Dorylus, whilst its other characters appear to me but specific 
distinctions. 
Species I. — Rhogmus fimbriatus, Shk, (Mon. Dor. p. 39.) Helvoluspilosus; abdomine 
glabro, segmento ultimo supra et duobu3 ultimis subtus fimbriatis; capite (chpeo anten¬ 
nis mandibulisque castaneis exceptis) nigro, venis alarum brunneis et pedunculo abdominis 
transverso-quadrato, convexo. Long. corp. lin. 17^. Expans. alar. lin. 22. 
Inhabits the Gold coast and the vicinity of the river Gambia. 
The splendid Orchidaceous plant figured is the Cattleya Aclandia; of Lindley, Bot. Reg. 
v. 26, pi. 48, a recently discovered species inhabiting Brazil. 
