XXI. CRABRO. 123 
SYNOPSIS OF THE SPECIES. * 
A. Abdomen subsessile or but slightly petiolated. 
I. Anterior tibie @ scutellate. 
I. a. Antenne @ subfusiform. 
1, crisrarius. Head and thorax longitudinally striated. 
2. paTELLATUS. Head and thorax punctured. 
Il. b. Antenne & filiform. 
3, scuratus. Metathorax with a distinct subcordiform enclosure at its base. 
4. cerratus. Metathorax without an enclosure at its base. 
II. Anterior tibie ¢ simple. 
Til. a. Anterior tarsi @ (first joint particularly) dilated. 
5. vExiLLatus. Head constricted posteriorly into a kind of neck. 
6. rarsarus. Head subquadrate, not much constricted posteriorly. 
b. Anterior tarsi g simple. 
1. Stemmata in an equilateral triangle. 
a. Abdomen marked with yellow. 
Iv. § Metathorar rugose. 
7. CEPHALOTES. Both sexes with a golden pubescence on the clypeus, inter- 
mediate tibie of 9 entirely yellow. 
8. sexcincrus. The ¢ with a silvery pubescence on the clypeus: 
* As the first three divisions of the table (all these divisions are numbered in 
the front margin for the convenience of reference) are primarily derived from 
the structure of the males, it will, perhaps, be useful to add characters whereby 
the females may be known. They would tabulate thus :— 
cRIBRARIUS. head transverse, dorsolum longitudinally 
Under division 4 striated. 
PATELLATUS. @ head transverse, dorsolum punctured. 
Under division 12: scurdrus. @ where it would be distinguished from the 
spinipectus by its superior size, yellow 
mandibles, and yellow spot on the clypeus: 
The females of cetratus, vewillatus and tarsatus are not known: 
