SUBFAMILY IX. — ZELIN^. 581 



in color from almost wholly piceous to entirely pale. Since the 

 absence of humeral spine and the pale abdomen are the two 

 main characters used by Bergroth in separating his pratermissa 

 described from Florida from his interjungens from North Caro- 

 lina, and since these characters are variable in all Florida 

 specimens, I unite the two species under the latter name which 

 has page priority. Its known range extends in the coast-wise 

 states from Maryland to Florida. The types of prcetermissa 

 were from Charlotte Harbor, Fla., and British Honduras, and 

 Barber has since recorded it from Ft. Myers, Everglade, St. 

 Augustine and Georgiana, Fla. 



IX. Arilus Burmeister, 1835, 227. 



Very large, stout-bodied species, having the front lobe of 

 head only about half the length of hind one, armed with a 

 short, stout curved spine in front of base of antennae, hind lobe 

 subcylindrical, but feebly narrowed backward ; ocelli small, 

 widely separated ; pronotum with main transverse constriction 

 at apical third, the front lobe constricted again near apex, its 

 front angles bearing a large conical tubercle ; hind lobe with 

 center of disk compressed and elevated to form a high arched 

 median crest, this armed above with eight or more short, ob- 

 tuse, shining blackish tubercles; hind margin prolonged back- 

 ward over scutellum, forked at apex, humeral angles subtrun- 

 cate, armed behind with a backward projecting tooth ; elytra 

 narrow, reaching tip of abdomen ; connexivum widely exposed, 

 strongly reflexed ; front femora moderately swollen, slightly 

 shorter than hind ones, unarmed beneath ; both they and tibiae 

 beset with short stiff erect hairs. Four species are known, all 

 from tropical or subtropical America, one extending northward 

 into our territory. 



In the members of this and the following genera each side 

 of the mesosternum is armed with a very small conical tubercle 

 and the presence or absence of such a flimsy character is used 

 by Stal and subsequent authors as the basis for separating 

 the subfamily into two tribes, or, in other words, is the pri- 

 mary character of their key to genera. Stal admits (1874, 6) 

 that "this tubercle, although usually more or less distinctly 

 elevated, is nevertheless at times, when the pectus is densely 

 sericeous, difficult to distinguish." 



