10 PROC. ENT. SOC. WASH., VOL. 24, NO. 1, JAN., 1922 



intersegmental membranes slightly lighter red than segments. Setae pale 

 yellow. Mandible with two setae. Spiracles very small; the mesothoracic 

 spiracle with diameter in proportion to diameter of abdominal spiracles as 

 3 : 2; peritrema and finger-shaped tubes slightly chitinized. Basal plate of 

 cerci circular, flat, well chitinized, covers median half of the dorsal surface of 

 ninth abdominal segment; cerci entirely absent. 



The present larva agrees in general shape, in size, color and 

 almost every detail, except the complete lack of cerci, with the 

 larva of Thaneroclerus girodi Chevrolat. In the family Cleridae 

 it belongs to the sub-family "D," established on larval charac- 

 ters by Boving and Champlain. 1 The genus Zenodosus Wol- 

 cott has been separated by Wolcott 2 from the genus Thaner- 

 oclerus Spinola, in which the present species hitherto was placed. 

 This separation, however, is hardly supported by any valid 

 larval characters. The only difference between the larvae of the 

 two genera as represented by Thaneroclerus girodi Chevrolat 

 and Zenodosus sanguineus Say is rudimentary cerci in the 

 former and no cerci in the latter form. All the other generic 

 characters are identical as comparison will show between the 

 generic description of Thaneroclerus given by Boving and 

 Champlain 3 and the present figures 1-1 1, Plate 4. 



EXPLANATION OF PLATE 4.< 



Zenodosus sanguineiis Say. 



Fig. 1. Ocelli and antenna, external view. 



Fig. 2. Left mandible, ventral side. 



Fig. 3. Labrum and clypeus, external view (epipharyngeal plate shining 



through). 



Fig. 4. Right mandible, dorsal side. 

 Fig. 5. Ocelli and antenna, internal view. 



Fig. 6. Larva, lateral view, slightly turned to show the epicranial suture. 

 Fig. 7. Mesothoracic spiracle. 

 Fig. 8. Third abdominal spiracle. 

 Fig. 9. Left leg of first pair. 

 Fig. 10. Maxillae, labium, mentum, submentum, gular plate with large conical 



protuberance. 

 Fig. 11. Basal plate of cerci on the dorsal side of ninth abdominal segment. 



'Adam Boving and A. B. Champlain: Larvae of North American beetles of 

 the family Cleridae. Proc. U. S. Nat. Mus., vol. 57, No. 2323, p. 620. 

 2 Ent. News, Vol. XXI, 1910, p. 321. 

 3 L. c., p. 621. 

 4 Drawings by Adam G. Boving. 



