1945] Two New Forms of Monomorium 63 
entire; anterior face flat, posterior face convex; peduncle short 
but evident and without ventral spine. Postpetiole globose and 
approximately equal to petiole in width, slightly lower in height. 
Gaster pyriform. 
Sculpture: Entire body glabrous, except the mesoepinotal 
impression and mesonotal and epinotal pleurae which have very 
fine rugulations, and the mandibles which are finely striate. 
Pilosity: Long, fairly numerous hairs on dorsum of head 
(including clypeus), thorax, petiole, postpetiole, coxae, tro- 
chanters, femora, prosternum, gula, and venter of gaster. Pu- 
bescence conspicuous on antennae and legs, extremely dilute on 
gaster, apparently absent on the head and thorax, and merging 
into hairs on the scapes. 
Color: Deep, metallic, bluish black like the queen but not as 
pronounced as in that caste; mandibles and tarsi yellow; an- 
tennae, coxae, femora and tibiae brownish. 
Female . — length 4. 5-5.0 mm. 
Head, excluding mandibles, slightly wider than long, with 
rounded occipital angles, and decidedly convergent anteriorly; 
posterior border straight. Clypeus broadly rounded with two 
widely separated, longitudinal carinae which project anteriorly 
as rather short, blunt teeth, the border of the clypeus between 
them appearing as a wide, shallow emargination. Frontal carinae 
short, extending posteriorly and parallel until near their termi- 
nation opposite the anterior edge of the eyes, where they diverge 
in evenly rounded curves. Eyes moderate and oval in outline, 
placed mid-way between the mandibular fossae and the posterior 
angles of the head. Ocelli prominent. Antennae 12 -segmented, 
the last four segments forming an indistinct club; scape evenly 
curved at the base. Mandibles 4-toothed, the basal tooth blunt, 
and the rest increasing in length to the rather long, sharp, apical 
tooth. Maxillary palpi 2 -segmented. Labial palpi 2 -segmented. 
Thorax from above as wide as the head and evenly tapered 
from end to end; in profile the mesonotum is moderately ele- 
vated and curved dorsally; scutellum divided into two lateral 
triangles which are separated by the forward extension of the 
postscutellum to meet the scutum; parapsidal furrows distinct 
but shallow; metanotum in the form of the usual transverse 
band. Epinotum in profile is evenly rounded and descends 
abruptly from the metanotum, there being no angular separa- 
