LACON. 265 



This species is closely allied to the following, L. suillus, but may be distinguished 

 from it by its more elongate shape, the sharper and more obliquely truncate hind angles 

 of the thorax, and the very shallow propleural grooves. The male has a very large 

 almost smooth space on the fifth ventral segment extending to the apex ; in the corre- 

 sponding sex of L. suillus this space is small, oval, and in the centre of the segment. 

 In some specimens of L. tuspanensis the propleural grooves are almost obliterated. 



3. Lacon suillus. 



Lacon suillus, Cand. Monogr. Elat. i. p. 159 x ; Revis. Elat. p. 101 2 . 



Hab. Mexico 1 2 , Orizaba (coll. Janson), Vera Cruz, Playa Vicente (Salle), Jalapa 

 (Hoge); Guatemala, Chacoj in Vera Paz (Champion). 



4. Lacon brevis. (Tab. XI. fig. 7.) 



Lacon brevis, Cand. Monogr. Elat. i. p. 156 1 ; Revis. Elat. p. 100 2 . 



Hab. Mexico, Yucatan 1 2 (Salle), Temax in North Yucatan ( Gaumer). 



Closely allied to L. suillus, but broader and with the thorax a little more constricted 

 behind. The male has a small, almost smooth, oval space in the centre of the fifth 

 ventral segment ; the apical margin of this segment is slightly thickened in both sexes. 



5. Lacon truquii. (Tab. XI. fig. 8.) 



Lacon truquii, Cand. Revis. Elat. p. 101 \ 



Hab. Mexico 1 (coll. Janson), Sayula in Jalisco, Jalapa (Hoge), Chilpancingo (Hoge, 

 H. H. Smith), Oaxaca, Tepansacualco (Salle) ; Nicaragua, Chontales (Belt). 



This species may be known from all the allied forms with ungrooved propleurae by 

 the rectangular hind angles of the thorax. The punctures on the interstices of the 

 elytra become more or less muricate towards the apex. The fifth ventral segment has 

 a transverse crenulated ridge before the apex in both sexes ; in the male the median 

 part of this segment is more sparsely punctured, the spaces between the punctures 

 densely, very minutely punctate. A specimen from Jalapa is figured. 



6. Lacon lezeleuci. 



Lacon lezeleucii, Cand. Monogr. Elat. i. p. 158 1 ; Revis. Elat. p. 101 2 . 



Hab. Mexico, Vera Cruz 1 2 (Salle), Jalapa (Hoge), Tepetlapa in Guerrero (H. H. 

 Smith) ; Guatemala, San Geronimo (Champion). 



Candeze distinguishes this species from L. scarrosus chiefly by the crenulate margins 

 of the thorax : the types of the two insects are before me and they do not exhibit any 

 appreciable difference in this respect. L. lezeleuci, however, may be distinguished from 

 L. scarrosus by the thorax being more feebly canaliculate behind and less convex (the 



biol. centk.-amer., Coleopt., Vol. III. Pt. 1, November 1894. 2 M 



