M. JACOBY, SOME BOLIY. AND ARGENT. PHYTOPHAG. COLEOPTERA. 521 



of equal width, the sides rounded, anterior angles obtuse, 

 posterior ones more distinct, the disc rather convex, impunc- 

 tate, flavous, scutellum black; elytra with some very minute 

 punctures, a narrow sutural stripe, abbreviated below the 

 middle and an equally narrow stripe, close to the lateral 

 margins and extending to the apical angles, black; epipleum\ 

 the under side and legs, flavous, posterior femora strongly 

 incrassate, the apex black, tibire non sulcate, the first joint 

 of the posterior tarsi longer than the following joints together, 

 claws appendiculate, prosternuni invisible between the coxa?, 

 the anterior cotyloid cavities closed. 



Hab. Argentine Rep. Tecuman. 



This genus was established by me on a species from Cen- 

 tral America (Biol. Centr. Amer.) allied to Systena but with- 

 out a thoracic sulcus, more narrow elytral epipleurse and an 

 extremely narrow or invisible prosternum. Several true spe- 

 cies of Systena have an almost exactly similar system of 

 coloration. There are three specimens before me. 



Galerncinse. 



Diabrotica Nordenskiöld! sp. n. 



Flavous, the antenme, the tibiéc and tarsi partly black, 

 head with four, thorax with seven black spöts, transversely 

 sulcate, elytra minutely puncturecl, påle yellow, each elytron 

 with seven piceous spöts (2.2.2.1). 



Length 5 — 6 mill. 



Elongate, feebly widened posteriorly, the head with a 

 few minute punctures and some very fine strigée directed to 

 its centre, flavous, the vertex with three, the middle with a 

 single black spöt, palpi black, the last joint flavous, antennae 

 with rather short joints, black, the basal one flavous below, 

 the second and third joint (united) rather longer than the 

 fourth; thorax subquadrate, the sides rounded anteriorly, con- 

 stricted at the base, the disc with a transverse sulcus near 

 the base, very sparingly and minutely punctured, flavous, 

 with seven black or piceous spöts, three placed in a triangle 

 at the middle and two (these forming a nearly united band) 

 at the sides, scutellum black; elytra nearly white or yellow- 

 ish, closely and finely impressed with dark punctures, a 



