NEOBROTICA AND RELATED GENERA — BLAKE 353 



these three species have been examined, but in all the females the 

 third antennal joint is not longer than the fourth, which is not true 

 of species of Cerotoma or Andrector. 



Potamobrotica viridis, new species 



FiauRE 103 

 About 6 mm. in length, elongate oblong oval, not shining, the elytra 

 densely, coarsely and tending to be striately punctate, bright green, the 

 elytra with reddish brown lunate markings at base and near apex, the 

 antennae with the intermediate joints brown, abdomen in places 

 yellowish, probably faded from green, tibiae somewhat deeper brown. 

 Anterior coxal cavities closed, claws appendiculate. 



Head with interocular space about half width of head, a median 

 depression over the faintly marked frontal tubercles, finely punctate 

 over the occiput; carina very short and in lower front not elevated; 

 green with the occiput deeper in color, mouthparts brownish. Anten- 

 nae pale with joints five to eight and tip of terminal joint brownish. 

 Prothorax nearly twice as wide as long, with slightly rounded sides 

 and transverse sulcus, surface finely punctate, entirely green. Scutel- 

 lum green. Elytra wider apically, a short intrahumeral sulcus, in one 

 specimen traces of costae; punctation very close, almost contingent, 

 coarsely and u-regularly striate; surface alutaceous, not at all shiny; 

 bright green with deep reddish brown markings in the form of a half 

 circle at base and apex of each elytron, these marks often broken into 

 spots. Body beneath green, in some specimens faded to more or less 

 uniform yellow. Anterior coxal cavities closed, the middle and hind 

 tibiae with spine, claws appendiculate. Length 5.8-7.5 mm; width 

 3.2-4 mm. 



Type, female, BMNH, Baly collection, from "Amazon." 

 Remarks: There are three specimens, all females, in the British 

 Museum all from the Baly collection, but only one with a legible 

 locality label. A single female without any label is in the Bowditch 

 collection, and another female in the U.S. National Museum, all old 

 and faded. This is the species that Bechyne wi'ongly identified as 

 Neobrotica brasiliensis Bowditch (from a specimen in the G. Frey 

 Museum, also a female), and placed in the genus Andrector. 



Rachicephala, new genus 



Elongate oblong oval, the head with wide-set eyes, protuberant 

 frontal tubercles; in the male an excavated lower front with forward 

 protruding appendages on each side above the labrum, and a long 

 median spine below the antennal sockets; in the female no such 

 appendages or spine but the lower front uneven with a small depression 

 on each side and in the middle. Antennae in the male with the first 



