Mexican and Central A?nerican Chauliognathinae. 165 



(J. Aedeagus : median lobe obliquely bent, produced at the apex 

 into a rather long spoon-shaped process ; left lateral lobe moderately 

 long, compressed, obliquely truncate at the tip, and with the upper 

 apical angle produced into a sharp curved hook; right lateral lobe 

 long, sinuously bent at the tip. Plate VIII, figs. 40, 40a. 



Length (excl. head) 8|-10i nina- (<:?$•) 



Hob. Mexico, Huetamo in Michoacan (Hoge). 



Seven females and three males, scarcely differing inter 

 se, except in the development of the black markings on 

 the upper side of the head. This species approaches 

 C.forreri, but has the prothorax strongly dilated anteriorly, 

 deeply sulcate down the middle, and broadly flavo- 

 marginate ; the elytra with an oblique dark vitta extending 

 from the shoulder to very near the tips. The aedeagus 

 also very similarly shaped. The following is a more nearly 

 allied form. 



38. ChauUognathus constrictus, n. sp. 



Dull, finely pubescent ; head black, more or less yellow in front ; 

 prothorax and elytra testaceous, the former margined with yellow 

 and sometimes with a black oblong patch on the disc, the latter in- 

 fuscate on the disc from a little below the base to very near the tip 

 (the infuscate portion sometimes becoming bifurcate anteriorly) ; 

 scutellum testaceous; antennae, apices of femora, tibiae, and tarsi 

 infuscate ; beneath flavous, the metasternum black across the middle 

 in $. Head moderately large in (J, smaller in $, the eyes not 

 prominent; antennae rather slender, long, joint 3 a little shorter 

 than 4. Prothorax slightly sinuate at the sides posteriorly, oblong 

 in (J, more rounded at the sides in $, the surface uneven and with 

 an abbreviated median groove. Elytra considerably wider than 

 the prothorax in (^, strongly subulate. 



(J. Aedeagus : median lobe obliquely bent, spoon-shaped at the 

 tip; left lateral lobe moderately long, rapidly widened towards the 

 base (as seen laterally), sinuous, angularly dilated at about the 

 middle within, the apical portion narrower, obliquely truncate, and 

 feebly hooked at the tip; right lateral lobe long, compressed, 

 distinctly hooked. Plate VIII, fig. 41. 



Length (excl. head) 8|-9 mm. ((^ ?.) 



Hab. Mexico, Huetamo in Michoacan {Hoge). 



Three males and one female. Very like C. flavo- 

 marginatus, and at first sight appearing to be nothing 

 more than a form of that species; but differing from it 



