90 PROCEEDINGS OF THE NATIONAL MUSEUM vol. los 



Genus Luperosoma Jacoby 



Luperosoma Jacoby in Whymper, Travels amongst the Great Andes of the 

 Equator, Supplementary Appendix, p. 87, 1891. 



The original generic description is as follows: 



Male. Body elongate; eyes entire; third joint of palpi robust, swollen; frontal 

 tubercles very swollen, transverse; antennae subfiliform, incrassate towards the 

 apex, second and third joints very short, subequal, fourth as long as the two 

 preceding joints together; thorax square-shaped, transversely depressed at the 

 disk; apex of the scutellum obtuse; elytra irregularly punctured, their epipleurae 

 indistinct below the middle; tibiae without spine "(not true)," the intermediate 

 emarginate at the apex; the inner margin produced in shape of a spine; posterior 

 first tarsal joint as long as the two following ones united; claws appendiculate; 

 anterior coxal cavities closed. Female. Intermediate tibiae without emargina- 

 tion, prosternum not visible. 



Type (of genus) Luperosoma marginaia. 



I am obliged to erect this genus for the reception of a small species of Galeruca 

 having the appearance of Diabrotica or Luperus, and distinguished from either 

 and other genera by the unarmed tibiae [there is a small spine on the middle and 

 posterior tibiae]; short second and third joints of antennae and the other char- 

 acters given above. The curious structure of the tibiae in the male is another 

 peculiarity of the genus which would enter Chapuis' 26th group, the Platyxanthi- 

 nae. 



Key to species of Luperosoma 



1. North American 2 



South American 4 



2. Elytra distinctly costate subsulcatum (Horn) 



Elytra not distinctly costate 3 



3. Elytra piceous with pale margin parallelum (Horn) 



Elytra entirely piceous schwarzi (Horn) 



4. Thorax entirely dark nigrum, new species 



Thorax pale with dark markings 5 



6. Large, 5 mm., last three antennal joints in male enlarged, pronotum with 



heavy lateral dark markings amplicorne (Baly) 



Smaller, 3-3.5 mm., joints 8-10 in male enlarged, pronotum pale with median 

 dark spot . marginatum Jacoby 



Luperosoma marginatum Jacoby 



Figure 4,c 



Luperosoma marginata Jacoby, in Whymper, Travels Amongst the Great Andes, 



Supplementary Appendix, p. 87, 1891. 

 Phyllecthrus marginatus Weise, in Junk, Coleopterorum catalogus, pt. 78, p. 109, 



1924. 



From 3-3.5 mm. in length, oblong oval, shining, the elytra very 

 faintly punctate, pale yellow-brown with piceous antennae and deep 

 brown occiput of head, a dark brown median area on pronotum, the 

 elytra sometimes with a wide brown median vitta on each elytron, 

 in other specimens this vitta so pale as to be nearly indistinct; body 

 beneath dark, legs for the most part pale, middle tibiae in male 

 notched, and antennal joints 8-10 swollen. 



