346 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.37. 



Group RHIGOPSES. 

 Genus RHIGOPSIS LeConte. 



RHIGOPSIS EFFRACTA LeConte. 



California (Wickham) ; Southern California. 



RHIGOPSIS SCUTELLATA Casey. 



Los Angeles County, California, May (Coquillett) ; San Diego, 

 California (Hubbard and Schwarz, Coquillett) ; Southern California. 



Group STRANGALIODES. 



KEY TO GENERA OF GROUP STRANGALIODES. 



Rostrum with scrobes feebly inferior, usually directed toward eyes, or visible from 

 above and badly defined. 



I. Seventh joint of funicle contiguous to club. 



1. Third joint of tarsi feebly emarginate, scarcely broader than the preceding; 



tarsi sparsely setose beneath; beak distinctly separated from head by trans- 

 verse depression Cimbocera Horn. 



2. Third joint of tarsi bilobed, distinctly wider than second; tarsi spinose be- 



neath; beak not separated from head by deep depression... MZorferes Casey. 



II. Seventh joint of funicle distant from club; third joint of tarsi broader than 



second, tarsi densely pubescent beneath. 



1. Scrobes deep, well defined, at least moderately arcuate, passing inferiorly. 

 a^. Scrobes strongly arcuate, passing beneath at a distance from the eyes. 



b '. First suture of abdomen straight; second segment never longer than the 



two following united ; hind tibiae mutic Dirhnxenus Horn. 



6^. First suture of abdomen arcuate; second segment as long as and fre- 

 quently longer than the two following united; hind tibia? mutic. 

 c '. Support of deciduous piece of mandible not prominent. 

 dK Anterior tibiae denticulate within; surface of body scaly without 



hairs; corbels of hind tibiae open Orimodema Horn. 



d'-. Anterior tibiae not denticulate, or indistinctly so; surface scaly or 

 hairy. 



e ' . Corbels subcavernous Mimetes Schonherr . 



e '^. Corbels cavernous; alternate elytral intervals slightly more convex; 



ventral scales plumose Amotus Casey. 



c^. Support of deciduous piece prominent; anterior tibiae not denticulate; 

 surface scaly, and with erect hairs. 

 /'. Corbels of hind tibiae cavernous; humeri entirely obliterated, 



Diamimus Horn. 

 /^. Corbels of hind tibiiie open; humeri rectangular.. J'en7aa;ia Horn. 

 a ^. Scrobes moderately arcuate, passing immediately beneath the eyes, 



Anametis Horn. 



a'. Scrobes narrow, deep and well defined throughout, obliquely descending 



to lower angle of eye, beak not depressed at base Melbonus Casey. 



2. Scrobes evanescent posteriorly, badly defined, nearly straight or flexed grad- 



ually downward, directed toward lower angle of eye. 

 a 1. Metasternal side pieces rather wide, suture distinct. 



b^. First ventral suture very deep and widely impressed, generally straight 

 or only slightly arcuate in the middle; second segment not longer than 

 the next two combined. 



