TRIBE III. — CORISCINI. 261 



tibiae unarmed; basal joint of hind tarsi more than twice the 

 length of second and third united. II. Megalotomus, p. 262. 

 dd. Pronotum as wide at base as long, the sides parallel; apex of hind 

 tibiae armed with a small acute tooth; basal joint of hind tarsi 

 about one and a half times the length of second and third 

 united. III. Burtinus, p. 263. 



cc. Second joint of antennae longer than first; sixth ventral of female 

 entire. IV. Coriscus, p. 264. 



bb. First joint of antennae not surpassing apex of head; osteolar open- 

 ing very small or obsolete. 

 e. Hind tibiae unarmed; hind margin of pronotum without a median 

 tooth. V. Tollius, p. 267. 



ee. Hind tibiae armed with two rows of spines ; hind margin of pro- 

 notum with a small median tooth. VI. Stachyocnemus, p. 268. 



I. Hyalymenus Amyot & Serville, 1843, 223. 



Elongate, slender bodied species having the head feebly 

 declivent, convex, triangular, almost as long as pronotum ; ocelli 

 very prominent, subpedunculate ; beak reaching middle coxa?, 

 the fourth joint a little longer than third ; pronotum subquad- 

 rate, strongly declivent, its side margins without carinas, 

 humeri each ending in a strong upward and outward projecting 

 spine ; abdomen a little wider than elytra ; connexivum nar- 

 rowly exposed, the hind angle of each segment prolonged; 

 membrane slightly surpassing abdomen, its veins numerous, 

 simple ; hind coxae contiguous ; front and middle femora armed 

 beneath near apex with one or two fine teeth ; hind ones 

 swollen, clavate, armed beneath with numerous teeth, two 

 near middle very prominent ; hind tibia? as in key, their lower 

 margin crenulate at middle of outer margin in the males; in 

 the females less curved, the margin entire. 



Three neotropical species are known from the United States, 

 one occurring in Florida. 



191 (318). Hyalymenus longispinus Stal, 1870, 213. 



Elongate, slender, depressed above, subconvex beneath. Above dull 

 yellow; antennae reddish, the apical half of terminal joint darker; under 

 surface pale yellow, meso- and metasterna tinged with fuscous; sixth 

 ventral and genital plate reddish-brown; hind tibiae and apex of femora 

 dark red. Antennae half or more the length of body, first joint longer 

 than head, the apical half feebly swollen, fourth longer than second and 

 third united, these subequal. Pronotum wider across the humeri than 

 long, disk depressed along the middle, finely, densely and deeply punc- 

 tate, transversely impressed near apex, the impression bearing a pair of 

 small median pale yellow callosities ; posterior side margins sinuate, mi- 

 nutely toothed at middle, their inner angle ending in a short spine; trun- 



