138 Mr. G. C. Champion's Revision of the Mexican 



Ten specimens seen, including three males. Separable 

 from P. major by the strongly hirsute legs, a character not 

 mentioned in the original description, and the immaculate 

 rufo-testaceous prothorax. The genital armature, too, is 

 very different, see Plate VII, figs, 46, 46a, 



Group Malthini. 



Gorham included all the genera with abbreviated elytra 

 under this group, but as there are various Chauliognathi 

 with the elytra incompletely covering the wings (as in 

 many species of Malthinus) it is obvious the character is 

 of little value. The species of the three genera here placed 

 under it agree, however, in having a small, acuminate- 

 ovate apical joint to the maxillary palpi, and, so far as at 

 present ascertained, symmetric genital armature, 



Thinalmus, 



Thinalmus, Gorham, Biol. Centr.-Am., Coleopt. iii, 2, pp. 101 

 (1881), 309 (1885). 



The two species of this genus, which so far as at present 

 known is peculiar to Central America, have the antennae 

 strongly flabellate in the male and sharply serrate in the 

 female. To the characters given for Thinalmus, the 

 following may be added : mandibles sharply dentate 

 within; apical joint of the maxillary palpi small, 

 acuminate-ovate ; terminal ventral segment cleft in ^ ; 

 genital armature symmetric. No fresh material has come 

 to hand since 1885, and there is therefore nothing to add 

 to Gorham's enumeration ; but the opportunity is taken to 

 figure the peculiar genital armature of T. centrolineatus, see 

 Plate VII, figs. 47, 47a. A male of T. pectinicornis was 

 figured by Gorham. These insects have the general facies 

 of Malthodes and Malthinus, but the (^ abdominal structure 

 is suggestive of Polemius, Silis, etc. 



Malthinus. 



Malthinus, Latreille, Gen. Crust, et Ins. i, p. 261 (1806); 

 Gorham, Biol. Centr,-Am., Coleopt. iii, 2, pp. 102, 309. 



The numerous Mexican or Central American species of 

 this genus now known may be grouped thus : — 



