SCARAB.EIDAE. 139 



The species are glabrous, or pubescent above ; the thorax is mar- 

 gined in front. The side pieces of the metathorax are narrow, 

 with the epiuiera moderate in size, or small. One spur of the 

 hind tibia? is frequently connate with the tibia? in the males. The 

 third joint of the antenna? is not elongated. 



The genera are not well defined, and in those having many 

 species considerable variation in the generic characters is seen. 



Some of the species of Lachnosterna, known familiarly under 

 the name June bugs, are very abundant, and do much harm by 

 destroying the leaves of fruit-trees. 



Claws never serrate, with a single tooth beneath ; 

 Ligula deeply emarginate ; 

 Antenna? 10-jointed. Eugastra. 



Antennae 9-jointed. Endeosa. 



Ligula nearly truncate ; 



Labruna bilobed. Lachnosterna. 



Labruni concave, not bilobed. ' Gynnis. 



Claws more or less serrate, sometimes toothed. Listrochelus. 



Eugastra (two species) belongs to the interior part of Texas ; 

 Listrochelus to the interior of the continent, from Platte River 

 to the Colorado of California. One species of Lachnosterna is 

 known from California ; the others all belong to the Atlantic 

 slope of the continent. 



Group II.— Tostegopterae. 



In this group the labial palpi are inserted at the sides of the 

 ligula, as in the next group, but the side pieces of the metathorax 

 are narrow, as in the Rhizotrogi. The third joint of the antenna? 

 is not elongated. The thorax is margined in front. 



The genus Tostegoptera contains two species, T. lanceolata 

 from Kansas and Texas, and T. eequalis from Texas. The females 

 are ovate and very convex, the males oblong; they are clothed 

 with small scales; the spurs of the hind tibia? are free in both 

 sexes ; the fourth and fifth ventral segments of the male are fur- 

 nished each with a small longitudinal crest at the middle. The 

 antenna? are 10-jointed, with 3-jointed club ; the joints 3, 4, and 

 5, are closely connected. The claws are slender, with a tooth 

 near the base. 



