and Central American Telephorinae. 19 



roughly sculptured and distinctly costate. Tarsal claws with a 

 sharp tooth which is much shorter than the claw itself. 



c^. Eighth ventral segment moderately large, oval; ninth seg- 

 ment semicircularly excavate, divided into two lobes, the apices 

 of which are shorter, narrower, and more sinuate than in P. mexi- 

 canus, the lobes of the corresponding dorsal segment narrower and 

 shorter, obliquely subtruncate externally. (Fig. 2.) 



Length (excl. head) 9-11, breadth 2J-3* mm. [S ?.) 



Hah. Mexico, Ciudad in Durango (Hoge). 



One pair. Less elongate than P. mexicanus, the pro- 

 thorax of the male much smaller and narrower, the antennae 

 {(^) shorter, the head black in front, the terminal abdominal 

 segments somewhat differently shaped in (^. 



Plectonotum. 



Pledonotum, Gorham., Biol. Centr.-Am., Coleopt. iii, 2, 

 p. 306 (1885) (sine descr.) ; in Whymper's Great 

 Andes, Supp. App., p. 51 (1891). 



Gorham's type of Plectonotum, P. nigrum, was from 

 Ecuador, and his P. labiale is presumably congeneric with 

 it. The seventh ventral segment of the latter is undivided 

 in the male and the genus therefore cannot be very nearly 

 related to Silis. The ^ tarsal claws are uncleft. The 

 prothorax has a thickened bead-like margin extending 

 backward to near the acute hind angles, and it is very 

 similarly shaped in the two sexes. Asilis {Aclytia) tenui- 

 culus, Broun, from New Zealand, is very like P. labiale. 

 Several species of Plectonotum from South America have 

 recently been described by Pic and one from Arizona by 

 Schaeffer. 



1. Plectonotum labiale. (Plate VIII, fig. 50, prothorax, cJ.) 



Plectonotum labiale, Gorh., Biol. Centr.-Am., Coleopt. iii, 

 2, p. 307. 



cJ. Eyes large; antennae very long, as long as or longer than 

 the body, closely set with rather long projecting hairs ; last ventral 

 segment transverse. 



$. Eyes smaller; antennae much shorter, about reaching the 

 middle of the elytra, clothed with shorter hairs. 



Hab. Panama, Volcan de Chiriqui. 



A long series seen, females as usual preponderating. 



