2 
Psyche 
[March 
drawn against S, louisianae. Relationships to other species 
have not been overlooked, however, as each of the three 
forms has been compared with all other neotropical species 
of Strumigenys known to me, both described and unde- 
scribed, except S. fusca and S. unidentata, two species to be 
placed among the species inquirendae. 
The measurements given are stated in the way standard 
in recent publications dealing with the dacetine ants. Ab- 
breviations: TL, “total” or synthetic aggregate length of 
body, including mandibles ; HL, maximum measurable 
length of head proper; ML, exposed length of mandibles; 
WL, (Weber’s) diagonal length of alitrunk, lateral view; 
Cl, cephalic index, or maximum head width expressed as a 
percentage of hl; mi, mandibulocephalic index, or exposed 
length of mandibles expressed as a percentage of HL. 
Material studied originated from, and is redeposited in, 
the W. M. Mann and National Museum Collections, United 
States National Museum (USNM) ; Borgmeier Collection, 
Petropolis, Brazil; series are also placed by exchange in 
the Museum of Comparative Zoology, Harvard University 
(MCZ). Thanks are due Father Thomaz Borgmeier, Dr. 
W. M. Mann and Dr. M. R. Smith for the privilege of exam- 
ining the above-mentioned series. 
All three species, like S. louisianae, belong to the nomin- 
ate subgenus of Strumigenys. 
Strumigenys clasmospongia new species 
Holotype worker: TL 2.57 mm., HL 0.60 mm., ml 0.39 
mm., WL 0.58 mm.. Cl 74, Ml 65. 
Similar to S. louisianae, but differing in its larger, dis- 
tinctly more slender body and relatively much longer man- 
dibles, and also in the following details: 
(1) Promesonotum with a fine but distinct median 
longitudinal carinula; lateral carinuliform margins also 
more distinct, and on each side of the mesonotum forming 
a low, rounded translucent flange ; posterior to each of these 
flanges is a second smaller, but similar flange at each pos- 
terior mesonotal corner. Homologous, but much less dis- 
tinct flanges may sometimes be seen in S. louisianae 
workers. 
