20 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loi 



Cordoba, Panama, and Frontera in Tabasco. One from the last- 

 named locality was sent to me from the British Museum and identified 

 as cai'inatus by Bryant, who synonymized melancholicus with caH- 

 natus. The result of dissection shows that this specimen is M. tibialis 

 Jacoby. The Cordoba and Panama specimens each represent 

 different species. And the specimens from Paso del Norte and Aca- 

 pulco are two more distinct species, making in all five species of those 

 that I have examined that Jacoby placed under the name melancholi- 

 CKS. In view of this confusion I have selected the type locality as 

 Cordoba, Mexico, in an endeavor to fix the species. This specimen 

 from Cordoba, a male, is smaller and flatter than M. carinatus with 

 less dense thoracic punctation having no tendency to be in confluent 

 lines. The scales on the head are finer. The tip of the aedeagus is 

 not so tapering, and the whole aedeagus is shorter. 



MYOCHROUS CARINATUS Jacoby 



Plate 1, Figure 7 



Myochrous carinatus Jacoby, Biologia Centrali-Americana, Coleoptera, vol. 6, pt. 

 1, Suppl., p. 230, 1891. 



From 5 to 6 mm. in length, elongate oblong, shining with a bronzy 

 luster through the yellowish-gray scales ; scales somewhat curved and 

 not hiding sculpture below entirely; prothorax a little wider than 

 long, with moderately coarse, dense, somewhat elongate punctures 

 tending to be in lines. 



Head densely covered with scales down to antennal sockets, with 

 the usual occipital ridge on either side of occiput (no more developed 

 than in other species, however) ; punctation beneath the scales some- 

 what visible and tending to be in lines radiating from the vertex. 

 Antennae reddish brown, of the usual proportions. Prothorax wider 

 than long (contrary to Jacoby's statement), with three lateral teeth 

 and the usual tooth at apex and base; punctation dense, moderately 

 coarse, tending to be in lines, but not ridged ; scales not flatly appressed 

 but a little curved. Elytra with a little depression below the basal 

 callosity, and transversely ridged especially in this depression ; scales 

 not so dense as to hide punctation, and short, curved, pale yellowish 

 gray mixed with pale brown ; elytral striae close, punctures touching 

 each other in basal portion, with transverse ridgings. Body beneath 

 with scattered punctures on the first abdominal segment, pubescence 

 fine and pale. Hind femora with a blunt tooth, anterior tibiae with 

 the usual tooth. Length 4.9 to 6.2 mm. ; width 2.3 to 2.7 mm. 



Ootypes. — In Bowditch collection, Museum of Comparative Zoology 

 (3 specimens) and ? in British Museum of Natural History. 



Type locality. — In an endeavor to exclude other species that may 

 be included in Jacoby's material, I hereby designate the type locality 

 as San Juan Bautista in Tabasco, Mexico, Hoge collector. 



