Mexican and Central American Chauliognathinae. 145 



12. Chauliognathus nigrocinctus. 



Chauliognathus nigrocinctus, Gorh., Biol. Centr.-Am., 

 Coleopt. iii, 2, p. 72, pi. 5, fig. 12 {^). 



Var. a. The common black post-median fascia of the elytra 

 reduced to a romided spot on the disc of each. 



Chauliognathus distinguendus, var, ?, Waterh., Trans. Ent. 



Soc. Lond. 1878, p. 328. 

 Chauliognathus signatus, Gorh., loc. cit. p. 72 ($). 



Var. $. The black basal fascia of the elytra wanting, the post- 

 median fascia reduced to a transverse streak on the disc of each ; the 

 pro thorax immaculate ; the head flavous at the sides in front. ($.) 



Chauliognathus bilineatus, var. 2, Gorh., loc. cit. p. 279. 



(J. Aedeagus : median lobe moderately curved, the apical portion 

 short ; left lateral lobe very long, concave, compressed and dilated 

 at the base, the long apical portion curved, hooked at the tip; 

 right lateral lobe short, compressed at the base, and obliquely 

 directed outward from about the middle. Plate VI, fig. 16. 



Hab. Mexico, Chihuahua, Durango, Guanajuato, Ja- 

 lisco, Guerrero, Oaxaca. 



A common insect in Mexico and sent in abundance by 

 Hoge from Sayula in Jalisco and by H. H. Smith from 

 Rincon in Guerrero. There is not the shghtest ground for 

 treating C. nigrocinctus and C. signatus as separate species. 

 C. nigrocinctus is smaller and less elongate than C. profundus 

 (= togatus, Waterh.), ochreous or flavous above, the 

 black head excepted; the prothorax with from 2-5 trans- 

 versely placed spots on the disc, which are often united 

 into a transverse fascia ; the elytra with a narrow complete 

 basal fascia, and a transverse fascia of variable width 

 beyond the middle, which is reduced to a rounded spot 

 on the disc of each in the var. signatus, black; the legs, 

 antennae, and abdomen in great part, black, the anterior 

 tibiae sometimes testaceous along their inner edge. The 

 differently shaped lateral lobes of the aedeagus separate 

 C. nigrocinctus from all the varieties of C. distinguendus, 

 which, moreover, never has a common narrow black basal 

 fascia to the elytra. The var. /? is represented by a single 

 female from Pinos Altos in Chihuahua. 



13. Chauliognathus bilineatus . 

 Chauliognathus bilineatus, Gorh., Biol. Centr.-Am., Coleopt. 



TRANS. ENT. SOC. LOND. 1914. — PART I. (JUNE) L 



