1945] Observations on Rhachiocrema 115 
There is often a delicate carinula lateral to each carina. The 
central lobe of the clypeus between the two carinse is distinctly 
sulcate. Both the sulcus and the carinae fail to extend entirely 
across the clypeus so that the posterior part of the clypeus 
forms an evenly convex bulge between the frontal lobes. The 
latter are narrow in front, scarcely covering the insertions of 
the antennae, but broad and poorly defined behind so that the 
frontal area is not clearly marked. Antennae eleven-jointed. 
Antennal scape long, slightly curved and rather thick at the tip. 
The scape exceeds the occipital margin by one-quarter of its 
length. Funicular joints all longer than broad, the first joint as 
long as the following three together, the last two joints forming 
a distinct club. Mandibles rather narrow and bearing four 
teeth, the two outer teeth longer than the inner two. 
Overall length of the thorax including the neck 1 mm. Pro- 
mesonotum seen from above pear-shaped, the promesonotal 
suture absent. The sides of the thorax at the mesoepinotal 
suture are strongly constricted above but less so on the lower 
portions of the meso- and metapleurae. Epinotum diamond- 
shaped, about as wide as the pronotum with much of its upper 
face built into the expanded bases of the spines. The spines 
long, straight and widely divergent; the basal half of each spine 
stout, the apical half much thinner. The distance between their 
tips is 1.4 mm. Seen in profile the promesonotum is not strongly 
convex. In some specimens it descends through an even curve 
to the shallow mesoepinotal suture. In others there is a short, 
steep posterior face which breaks the even outline of the pro- 
mesonotum. Basal face of the epinotum virtually flat between 
the base of the spines and the mesoepinotal suture. Declivious 
face largely involved with the base of the spines, the portion 
below the spines much shorter than the basal face. Anterior 
peduncle of the petiole distinct but only about one-quarter as 
long as the node, the latter somewhat longer than broad, broader 
behind than in front, with the sides feebly convex and narrow- 
ing to the shoulders which join the anterior peduncle. The pos- 
terior face of the node is straight and transverse, with a distinct 
angle where it joins the side. Posterior peduncle of the petiole 
almost as wide as the node itself and not quite as long as the 
anterior peduncle. Postpetiole seen from above transversely 
oval with distinct anterior and posterior peduncles. Seen in 
profile the petiole is wedge-shaped with a very feebly sinuate 
