65 



The antennae arise just below this frontal ridge in a short, 

 rounding groove running cephalad from the eye. On the 

 epicranium just above each compound eye are two, long 

 hairs arising from distinct pits. These pits are called setiger- 

 ous punctures. Similar punctures and hairs are found also 

 near the lateral margins of the clypeus. 



Clypeus. — The clypeus is broader than long, and projects 

 cephalad between the bases of the mandibles. Projecting 

 cephalad from the cephalic margin of the clypeus, is the sub- 

 quadrangular labnim^ with its distal margin slightly concave 

 outwardly. 



Compound eyes. — The compound eyes, on the lateral mar- 

 gins of the head, are comparatively small. 



Ocelli. — There are no ocelli. 



Genae. — The portions of the epicranium below the eyes 

 and antennae are Xhe geme and each projects cephalad, latero- 

 ventrad of the base of the mandibles, as a thin tapering 

 tongue curving inward slightly at its tip. Below this pro- 

 jecting process, the gena presents a rounded emargination, 

 and, filling in the emargination, may be seen the basal por- 

 tion of the maxillae. The genae form, with portions of the 

 occiput, the lateral portions of the ventral surface of the 

 head. 



Occiput. — The occiput, although fused with the epicra- 

 nium to form the firm head-box, is plainly separated from the 

 epicranium on the dorsal and lateral portions of the head by 

 an impressed line, which fades out on the lateral portions of 

 the ventral surface of the head, so that the postgenal and 

 occipital regions cannot here be distinguished. 

 . Gula. — Forming the mesai third of the ventral aspect of 

 the head, slightly widening caudad, and expanding at its 

 cephalic extremity to a narrow, transversal bar, which pro- 

 jects laterad to the genal emargination, is the gula, one of 

 the head sclerites, which is wanting or is fused with the sub- 



