Goleopterological Notices, V. 44t 



tarsi long and slender, the third joint a little longer than the second, with a 

 rather long single claw, having an exceedingly minute basal appendage as in 

 Euplectus. Length 1.6 mm. ; width 0.6 mm. 



California (Sta. Cruz Co.). 



The unique type is unfortunately broken into a number of pieces 

 from which the measurement has been compounded ; it is apparently 

 a female. 



OROPUS Casey. 



The median thoracic sulcus, which is so characteristic a feature 

 of Oropus and Rhexidius, is subject to singular malformation in 

 both of these genera, being sometimes completely interrupted or 

 irregularly broken up, apparently by reason of accidental circum- 

 stances attending emergence from the pupa, when the integuments 

 are in a plastic condition. I have figured one of these malforma- 

 tions in a species described under the name interi'uptus, and Dr. 

 Brendel has recorded another case in his description of Rhexidius 

 intermedins. 



The species of Oropus are readily divisible into two groups as 

 follows: — 



First dorsal segment relatively shorter ; eyes in the female much smaller 

 than in the male, the latter with the fourth dorsal not greatly modified, 

 having simply a transverse subbasal line of minute pubescence ; females 

 very rare in proportion to the males ; species generally larger. 



Head small, much narrower than the prothorax striatllS 



Head much larger, equal in width to the prothorax or extremely nearly so. 

 Head and prothorax relativelj'- smaller, the thoracic teeth exceedingly 



minute convexus 



Head and prothorax larger ; thoracic teeth larger, more distinct. 



Male with the fourth dorsal unimpressed, having a long very fine, 



transversely arcuate line of minute pubescence interriiptlis 



Male with the fourth dorsal impressed along the broader and shorter, 

 nearly straight subbasal line of pubescence ; elytral striae more 



abbreviated ; size smaller allbreviatllS 



First dorsal relatively much longer ; eyes in the female only slightly smaller 

 than in the male, but with the facets smaller and mutually much more 

 distant ; male with the fourth dorsal broadly concave, the upper margin 

 produced posteriorly and closing inferiorly the produced median lobe of 

 the third ; males rare, the females abundant ; size generally smaller ; 

 elytra more abbreviated. 

 Larger species ; pronotum sparsely and simply punctate throughout. 



in on tan IIS 

 Small species ; pronotum densely and strongly granulose between the trans- 

 verse sulcus and the basal margin cavicauda 



