876 



FAMILY XLIII. — PTINlDiE. 



the pubescence a little shorter and more recumbent and the punctuation a 

 little sparser. Metasternum with a fine raised line extending from the side 

 margin obliquely inward and backward. Length 1.5 mm. 



Lawrence County; rare. June 6. Swept from vegetation at 

 side of wagon road. Known heretofore from New Jersey to Ohio. 

 The small size, more elongate form and bicolored upper surface 

 readily distinguish it from serricorne. 



Megorama simplex Lee, elongate-oval, blackish-brown, with fine 

 recumbent grayish-yellow pubescence, length 3.5-4.5 mm, was de- 

 scribed from Kentucky. 



Tribe V. DORCATOMINI. 



The members of this tribe are distinguished from all others of 

 the family by their highly developed contractile power. The an- 

 tennae and mouth organs are completely hidden in repose, the head 

 being strongly refiexed and received into a deep cavity on the 

 under side of the thorax and the legs withdrawn into suitable ex- 

 cavations in the meso- and metasternum and first ventral segment. 

 In form they are usually broadly oval, varying to elongate-oval 

 or even globose; and all are less than 3.5 mm. in length. Fall 

 in his Revision removes to this tribe a number of genera placed by 

 LeConte and Horn in the Anobiini and Xyletinini, so that the 

 classification and arrangement of the Henshaw List is much broken 

 up. In all the genera so removed, the metasternum and first ven- 

 tral segment are deeply excavated for the middle and hind pairs of 

 legs, these excavations forming the principal characters upon which 

 the tribe Dorcatomini is based. Of the eleven genera recognized 

 by Fall, representatives of seven have been taken in Indiana. The 

 genera, as well as the species of each, are very difficult to separate 

 unless they are clean and opened up so that the under parts can be 

 readily studied with a lens. 



KEY TO INDIANA GENERA OF DORCATOMINI. 



a. Front coxa? expanded at apex into transverse horizontal plates which 

 are not concealed in repose ; trochanter joined to the coxa from be- 

 hind. 



Z>. Metasternum with broadly expanded front lobe which covers the 

 mouth in repose ; hind coxal plates wider on the inner side ; form 

 elongate-parallel. XII. Petalium. 



b~b. Metasternum with a short front lobe which does not reach the mandi- 

 bles; form elongate-oval, 

 c. Two outer joints of antenna? closely united ; front coxa? widely sep- 

 arated ; hind coxal plates wider on the outer side ; mesosternum 

 depressed. XIII. Eupactus. 



