496 PHYTOPHAGA. 



This species differs from 0. minor in its more slender and narrowly elongate shape, 

 in the black band of the thorax, and in the longer antennae. I have also included here, 

 provisionally, the specimens from Capetillo, although they seem to be intermediate 

 between this and the preceding species : some of these are devoid of a black thoracic 

 band, and have black elytra and legs, besides being of smaller size, and it is therefore 

 possible that they represent an allied but different species. 



MONOXIA. 



Monowia, Leconte, Proc. Acad. Phil. 1865, p. 221 ; Leconte and Horn, Class. Col. N. Am. p. 348 



(1883). 



Monoxia was established by Leconte on some small species, mostly testaceous in 

 colour and with more or less spotted elytra ; it is separated from the preceding genera 

 by the short antennas, the joints of which (with the exception of the third) are not 

 elongate, but rather broader than long, and gradually dilated towards the apex ; another 

 character, supposed by Crotch to be a sexual one, is the sometimes simple claw in 

 Monoxia. The different species do not seem at present to be well denned ; all are 

 apparently subject to a good deal of variation, and necessitate long series for exami- 

 nation ; those hitherto described are from North America. Two or three species from 

 our country agree so closely with North-American forms, that I am unable to separate 

 them ; the one described by myself from Guatemala was wrongly placed in Monoxia, 

 the genus being known to me from description only at that time. 



1. Monoxia obtusa. (Tab. XXVII. fig. 24.) 



Monowia obtusa, Lee. Proc. Acad. Phil. 1865, p. 222 \ 



Hob. Noeth America 1 . — Mexico, Northern Sonora (Morrison). 



I believe that I am right in referring the few specimens from Sonora before me to 

 Leconte's species. The elytra in these examples are uniformly pale testaceous in 

 colour, and densely clothed with rather long greyish hairs, which obscure any punc- 

 tuation ; they are devoid of black spots, though in certain lights, and with a strong 

 lens, some very obscure small pale spots arranged in rows may be seen. The under- 

 side is of a darker fuscous colour ; the claws appear to be simple. In size the Sonoran 

 insect is larger than any of its allies known to me. A North-American specimen 

 kindly sent me by Dr. Horn, and doubtfully referred by him to M. obtusa, agrees 

 entirely with those from Sonora. In the Munich Catalogue M. guttulata,'hec, is 

 given as a variety of M. obtusa on the authority of Crotch (cf. Proc. Acad. Phil. 1873 

 p. 56) ; but as Leconte's description gives two impressions of the elytra as a character 

 of distinction from M. obtusa, it probably refers to another species. 



