II. MYRMOSA. 33 
(b) Thorax of the g divided by sutures. 
Genus II. Myrmnosa. Lat. 
Heap subglobose ; stemmata in a triangle on the vertex ; eyes 
small, round, and lateral ; antenne subfiliform, inserted in the 
@ at each side of the base of the clypeus and approximate, 
in the ¢ they are wider apart; the clypeus triangular and 
longitudinally carinated in the @, in the ¢ transverse and 
plane ; mandibles unidentate and acuminate in the ?, large and 
tridentate inthe ¢. The THorax longitudinally quadrangular, 
the angles in front rounded; the collar subquadrate, and the 
metathorax truncated 9 ; in the ¢ the THORAX ovate ; collar 
transverse, and curving towards the base of the wings poste- 
riorly, but not reaching them; the metathorax descending on 
an inclined plane, and having on each side two short teeth; 
the superior wings with one marginal and four submarginal cells 
—the second submarginal triangular, receiving the first recurrent 
nervure near its centre—the third quadrate, receiving the second 
recurrent nervure at about one-third of its length—the fourth ex- 
tending to the apex of the ning ; the legs moderately long, and 
spinose. ¢. ABDOMEN ovato-conic, the first segment some- 
what narrower than the second ; in the ¢ aBpomen oblong, and 
the margins of the segments crenate, the last concave above, 
and tridentate at its apex, which is truncated. 
Type, M. melanocephala. 
+4+ This genus was first established by Latreille, in 
1796. It was not adopted by Fabricius, but all subsequent 
Entomologists have received it. 
Sp. 1. MELANOCEPHALA. Fab. 
rufa, capite abdominisque apice ngris ¢. 
tota nigra é. 
length @ 13—3 lines. ¢ 33 lines, 
Lat. Hist. 13. 266; Gen. Pl. 13. f. 6 9 ; Nouv. Dict. H. N. 22. 150. 
Pl. G. 17, 11 ; Guerin, Icon. du Reg. An. Insectes, Pl. 69. f. 6. 
D 
