226 COCCINELLID^E. 



As is usual with very generalized types, Scymnus is represented by a large number 

 of species in every part of the globe, often very closely allied to each other even when 

 coming from distant parts. Chapuis has, in the ' Genera des Coleopteres,' very much 

 restricted the group. I should go still further and eliminate from it the Rhizobiides, 

 a subfamily separated by several peculiarities, and not of such universal distribution. 



SCYMNUS. 

 Scymnus, Kugelann, in Schneider's Mag. i. p. 545 (1794). 



Scymnus is a genus consisting of a host of small species, distributed in every part of 

 the world, found on trees and on low herbage, living on small Aphides and possibly 

 Coccidse. 



Subgenus Diomus, Mulsant. 



Coxal fossettes on the first abdominal segment not forming more than a quarter 

 circle. 



1. Scymnus thoracicus. (Tab. XII. fig. 18.) 



Coccinella thoracica, Fabr. Syst. Eleuth. i. p. 378 \ 



Scymnus thoracicus, Muls. Spec. Col. Trim, secur. p. 951 2 ; Crotch, Rev. Coccin. p. 269 s . 



Eab. Mexico, Chihuahua city, Zacualtipan, Jalapa (Roge), Chilpancingo in Guerrero 

 (II. H. Smith), Toxpam (Salle). — South Ameeica 1 2 . 



2. Scymnus panamensis. (Tab. xil. fig. 19.) 



Suborbicularis, niger, nitidus, pubeseens ; capite, protborace pedibusque aurantiacis ; etytris subsenescentibus, 

 subtilissime punctatis. Long 1*75 millim. 



Hah. Panama, Volcan de Chiriqui (Champion). 



There are two examples of this, which is a larger, broader, and more pubescent 

 insect than the one referred to S. volgus, and the elytra have a distinctly brassy tinge. 

 The body beneath is also wholly black, with the exception of the head (with all the 

 mouth-organs) and the thorax. The genitalia are obtruded in one of the examples and 

 are red. The thorax is three times as wide as long, with rather prominent front 

 angles (in the specimen here referred to S. volgus the front margin is nearly straight), 

 the margin being broadly cut out in front. The abdominal coxal fossettes appear to 

 me to be ill defined externally, the internal side reaching almost to the edge of the 

 segment. 



3. Scymnus volgus ? 



Scymnus (Polius) volgus, Muls. Opusc. Entom. iii. p. 147 (1853) l . 

 Scymnus volgus, Crotch, Rev. Coccin. p. 271 2 . 



