MONOGRAPH OF THE DORYLIDES. 
79 
Species I .—JEnictus ambiguus , Shk. (Mon. Dor. p. 24). Rufo-testaceus, pubescens, 
capite (antcnnis mandibulisquc cxceptis) et thorace nigro, mandibulis longissimis ; facie 
carina media subtus furcata, alarum venis stigmateque fuscis, pedunculo profunde cana- 
licuiato. Long. corp. fere lin. 4. Expans. alar. lin. (PI. 20, fig. C., head.) 
Habitat India Oriental^ Poonah. In Mus. Sykes, Saunders, et AVestw. 
Species II .—JEnictus certus , AV. Rufo-fulvescens, pubescens, capite brunneo-nigro, mandi¬ 
bulis sub-brevibus, stigmate alarum fusco, venia fulvo-fuscis, pedunculo antice angnstiori, 
disco subpiano. Long. corp. (abdom. incurv.) lin. 3-J. Expans. alar. lin. 7^. 
Habitat? In Mus. Soc. Linn. Lond. 
Head pitchy or brunneous black, the face redder brown; the antennas fulvous, with long 
slender hairs; mandibles short, falcate, and fulvous. The thorax is fulvous, finely setose. 
The abdominal peduncle is somewhat triangular; the sides rather rounded, and the posterior 
angles not acute ; the sides arc slightly elevated, and the disk is nearly flat and not channelled 
in the middle; the second, third, and fourth segments of tlio abdomen are of nearly equal size, 
the fifth is much longer than cither of these segments, the sixth is much shorter, and the 
seventh is about as long as the sixth. The male organs are concealed. The wings are 
throughout more stained with a light fulvous tint than in JEn. ambiguus. The stigma is 
fulvous, and the veins are fulvous-brown. There is considerable difference in the position of 
these veins in the two known species. The cubital vein arises very near the postcostal in iEn. 
certus, but at a distance from it in iE. ambiguus, in consequence of which the first cubital cell 
is smaller than the second discoidal cell in the former, whereas they are of equal size in the 
latter; this is further increased by the vein which separates the first and second discoidal cells 
being deflexed at its extremity in iE. certus, whereas it is straight in iEn. ambiguus, termi¬ 
nating at a greater distance from the extremity of the anal vein ; moreover the transverse veins 
which close the extremity of the cubital and discoidal cells are much more angulated in 
iEn. ambiguus than they are in iEn. certus. 
Dorylus, Fair. 
The species of this genus are confined to Africa and Asia. 
They are distinguished by possessing very short feet, with com¬ 
pressed femora, two submarginal cells, and only one recurrent vein 
in the fore wings. 
A. —Peduncle cup-shaped, nearly as large as the following segment. 
Species I .—Dorylus nigricans , Illiger (Fabr. Shk. Mon. Dor. p. 28). Nigricans, brunneo- 
holosericeus, capite magno, abdominis petiolo acetabuliformi, segmento 2do paullo 
minori, oculis minutis. Long. corp. lin. 13. Expans. alar. lin. 21-£. 
Inhabits Sierra Leone. 
B. —Peduncle cup-shaped, much smaller than the second segment. 
Specif.9 II .—Dorylus helvolus , Linnajus, &c. (Shk. Mon. Dor. p. 29). Helvolus pilosus ; 
capite rufo, facie opalina convexa, petiolo acetabuliformi, 2do segmento multo minori. 
Long. corp. lin. 12^. Expans. alar. lin. 21^. 
Inhabits the Cape of Good Hope. 
Species III.— Dorylus affinis , Shk. (Mon. Dor. p. 30). Helvolus pilosus; capite rufo- 
castaneo; facie plana, petiolo acetabuliformi, 2do segmento multo minori. Long. corp. 
lin. 10J. Expans. alar. lin. 19. 
Inhabits the vicinity of the river Gambia. Differs from the preceding in its smaller size, in 
the cubital nervuro being slightly undulated (instead of straight), as far as the separation 
of the two suhmarginal cells and the recurrent nervure, inserted at fully one-half of the 
length of the first of the latter. 
C. —Peduncle quadrate, mandibles slender and much acuminated. 
Species IV .—Dorylus glabralus, Shk. (Mon. Dor. p. 31). Rufo-brunncus, glaher, suh- 
robustus, venis alarum uigris, vertice valdeprominente. facie in medio sulcata, mandibulis 
attenuatis, labro tubcrculis binis obtusis instructo ct pedunculo abdominis transverso- 
quadrato. Long. corp. lin. 14-J. Expans. alar. lin. 23 
Inhabits the vicinity of the river Gambia. 
