THE CANADIAN ENTOMOLOGIST. 181 



Family IV. — CephiD/E. 

 This group was first treated as a distinct family by that master 

 systematist, A. H. Haliday, as early as 1839. 



Dr. Von Dalle Torre has credited the group to Westwood, evidently 

 without having observed that Westwood, in his Introduction, merely 

 accepted the views of Haliday, treating the group, however, as a sub- 

 family instead of a family. 



The genera have been recently tabulated by Konow as follows : 



Table of Genera. 

 First joint of flagellum not or scarcely longer than the second, the 



flagellum towards tip more or less clavate 5. 



First joint of flagellum distinctly longer than the second, the flagellum 

 towards tip not thicker than at base. 



Hind wings with a complete cubital eel! ; hind tibite with one or 



two spurs before tip 2. 



Hind wings without a complete cubital cell ; hind tibial without 

 spurs before tip ; last ventral abdominal segment in (^ without 

 an emargination Caenocephns, Konow. 



2. Antennae thickened at the middle 3. 



AntennjB filiform, uniformly thickened, or with joints 3-5 slightly 



compressed 4. 



3. Abdomen short and thick, at the most about half the length of the 



thorax ; antennae shorter than the head and thorax united, distinctly 

 thickened before tip ; last ventral segment in $ ending in a short 

 thickened knob, produced upwards into a distinct process, the 



penultimate ventral segment normal Pachycephus, Stein. 



Abdomen long, fully twice as long as the thorax ; antennae longer than 

 the head and thorax united, feebly thickened at the middle ; last 

 ventral segment in $ emarginate at apex, the penultimate with a trans- 

 verse impression, clothed with erect black bristles. . . Syrista, Konow. 



4. Hind tibiae with a single spur before the tip ; antennae with joints 



3 and 4, and sometimes 5, compressed, the following to apex, of 



nearly an equal thickness Macrocep/ius, Schlecht. 



Hind tibiae with two spurs before the tip ; antennae rather slender, 

 filiform Ja>ius, Stephens. 



5. Pronotum quadrate, longer than wide, with the head thickly punctured, 



flat, scarcely emarginate behind ; antennae long, very feebly thickened 

 toward apex ; hind tibiae usually with only one spur before the 

 tip Cahii/ieiita, Konow. 



