1892,] ENTOMOLOGICAL NEWS. II 



and thorax above clothed with short, erect, fuscous hairs; the clypeus, 

 face, cheeks and thorax beneath with silvery pubescence. Length 9 — 10 

 mm. 



(^. — Differs from the female as follows: joints five and six of the an- 

 tennae roundly emarginate beneath, the seventh joint slightly so; the third 

 antennal joint very slightly, if any, longer than the fourth; the metanotum 

 •with eight or nine strong ridges, which extend from the base to the trans- 

 verse ridge; wings darker along the costa. Abdomen strongly punctured, 

 the punctures closer than in the female, the first segment, except the base 

 and apex, and a transverse fascia on segments 2-5 above, reddish brown, 

 the fascia on the third segment narrowest; beneath the abdomen is finely 

 and rather closely punctured. Length 9 mm. 



Described from two females and one male specimens. Col- 

 lected by Mr. Chas. W. Johnson, in Florida, in the vicinity of 

 St. Augustine. 



(To be continued.) 



RHEXIDIUS. 



BY EMIL BRENDEL, M. D. 



This genus belongs to the second group of the tribe Trichonyni 

 according to the arrangement of Mr, Achille Raffray, the first 

 group having the posterior coxae distant and the first ventral seg- 

 ment large, including the genera Trichonyx and Amauronyx, 

 while the remaining genera, or the second group, have the pos- 

 terior coxae contiguous, or nearly so, and the first ventral seg- 

 ment very short, in some hardly visible. Among the latter group 

 my attention is called to the genera Trogaster, Rhexidms, Oroptis 

 and Prorhexius. 



Trogaster is characterized by having the first ventral segment 

 visible (according to Mr. Raffray), while in the others it is said 

 to be invisible, except as a button between the coxae. But this, 

 according to my investigation, does not apply to Rhexidms and 

 Oropus, on which, by lifting the femur it can be traced to the 

 sides of the abdomen, where it is even more visible than in the 

 middle. Thus the difference between the four genera is rather 

 inconspicuous. 



With the genus Trogaster I am not acquainted, but by the 

 description of Dr. D. Sharp, it should have an analogous form 

 with Oropus and Rhexidms, and Capt. Casey indicated to me as 

 the differences: the pronotum having the lateral spinous tubercle 



