62 
Psyche 
[June-September 
ate hairs. Larger specialized hairs all fine, long, flagelliform, more or 
less erect: a pair on each lateral occipital border (2 pairs in lanugin- 
osa) I, a pair on the middle occiput, a pair on the humeri and another 
pair on the mesonotum. Both nodes and both upper and lower sur- 
faces of the gaster with a luxuriant growth of abundant, long, fine 
flagelliform hairs, the longest of which, on the gastric dorsum, are as 
long as or longer than the petiole. Each inner mandibular border 
bears a row of fine oblique sensory hairs. 
Males of neither species have yet been found. S. lanuginosa occurs 
in Central America and southern Mexico, and has apparently been 
introduced into the Bahamas, while S. hindenburgi is known from 
southern Brazil and northern Argentina. 
Struinigenys lanuginosa Wheeler 
Strumigenys lanuginosa Wheeler, 1905, Bull. Amer. Mus. Nat. Hist. 21: 104, 
fig. M, worker, female. Type loc. : Fort Charlotte, Nassau, Bahama Islands. 
Syntypes in AMNH, MCZ, several examined. 
Worker: TL 24-2.7, HL 0.55-0.60, ML 0.35-0.38, WL 0.58- 
0.64 mm; Cl 79-80, MI 63-64. Measurements from 5 workers, in- 
cluding a syntype, Panamanian and Mexican specimens. 
Main distinguishing features: 
( 1 ) Small size and slender build. 
(2) Dorsolateral borders of head merely cariniform, not lamellate. 
(3) Mandibles without a trace of a denticle basad of preapical 
tooth. 
(4) Basal costulae of gaster extended as fine, sericeous striation 
(striolation) over the basal third or more of the first segment. 
Gastric pilosity also more abundant and crowded than in S. 
hindenburgi. 
( 5 ) Two pairs of flagellate hairs on the lateral occipital margins. 
(6) Postpetiole usually with traces of fine longitudinal striolation 
or costulation overlying the punctulation. 
Color light ferruginous, gaster often slightly more brownish. Man- 
dibles and appendages lighter, more yellowish. 
Female (dealate) : TL 2.9-3.0, HL 0.62-0.63, ML 0.36-0.38, WL 
0.72-0.73 mm; Cl 80-84, MI 57-61 (from 2 syntypes). Males un- 
known. 
Distribution: Southern Mexico, Panama; in Bahamas, where prob- 
ably introduced historically. 
Localities for material examined: Bahama Islands, Nassau (W. M. 
Wheeler leg.), type locality. Mexico, Veracruz: Cordoba (C. H. 
Seevers leg.) , one worker under stone. Pueblo Nuevo, near Tetzonapa 
(E. O. Wilson leg.), strays from leaf litter in tropical evergreen for- 
