476 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
200. Camponotus (Myrmoturba) melanoticus Emery var. substitutus 
Emery. 
Numerous workers were found at Natal, Independencia, and in the 
Maranguapé Mountains. The species nests beneath stones. 
201. Camponotus (Myrmothrix) rufipes (Fabricius). 
The typical form of this species was common, nesting in logs and 
beneath bark, at Ceara4-Mirim, Parad, and Porto Velho. 
202. Camponotus (Myrmothrix) abdominalis (Fabricius). 
Very common at Natal, Ceard-Mirim, Baixa Verde, Parad, and 
Madeira-Mamoré Camps 39 and 46. 
203. Camponotus (Myrmothrix) abdominalis var. atriceps F. Smith. 
A single colony was taken at Abunda, Bolivia. 
204. Camponotus (Myrmothrix) rapax (Fabricius). 
Plate 5, fig. 38. 
Worker major. (Plate 5, fig. 38). Length 12 mm. 
Head one and a third times longer than broad, narrowed in front, 
posterior angles narrowly rounded, occipital border narrowly and 
rather deeply concave; the sides straight and subparallel until a little 
in front of middle, then convergent. Mandibles large, elongate, with 
six teeth on the blade. Clypeus a little broader than long, attaining 
side margin of head, strongly carinate, the anterior border of middle 
convex. Frontal area distinct, quadrangular. Frontal carinae evenly 
curved from base to end, which is opposite the middle of eye. Eyes 
small, rather flat. Antennae slender, the scapes bent at middle, 
extending three eighths their length beyond the occipital corners; 
funicular joints long and cylindrical, gradually decreasing in length 
apically. Pronotum broader than long, rounded at sides and above, 
in front finely margined. Mesonotum slightly longer than broad, nar- 
rowed behind, the base slightly less than twice the breadth of posterior 
portion. Epinotum at base divided by a distinct transverse suture; 
evenly rounded in profile; narrow above, three times as long as broad. 
