124 OENERA OF HYMENOPTERA. 



latter genus, found in Nevada and California, is quite small in com- 

 parison with the generally large, fine species of Mnsarls, of which 

 seven have been described from Texas, Colorado and California. 

 The geographical distribution of the s{)ecies of this genus is remark- 

 able, the only other two representatives known being found in North 

 Africa. Nothing is as yet known regarding their habits. 



The following characters will sufficiently separate the genera : 



Table of Genera. 



Anterior wings with two complete submarginal cells, the second subniarginal re- 

 ceiving both recurrent nervures ; antennse * f % long and knobbed at tip, 

 that of 9 short and clavate Masaris Fabr. 



Anterior wings with three complete subniarginal cells, the second and third snb- 

 margiuals each receiving a recurrent nervure ; antennae rather short and 

 clavate in both sexes Euparagia Cress. 



Family EUMENID^. 



In this family, comprising the Solitary Wasps, the antenna? are 

 filiform or nearly so, and often terminated by a hook in the % ; the 

 intermediate tibiie have but one apical spur and the tarsal claws are 

 unidentate. The genera with sessile or subsessile abdomen are closely 

 allied, the only charactei-s, so far discovered, by which they can be 

 separated, are those found in the structure of the mouth-parts, which 

 unfortunately are oft,en concealed ; there are, however, certain su|)er- 

 ficiul differences of form and facies, impossible to describe intelli- 

 gently, but which enable a practiced eye to distinguish the genera 

 without recourse to an examination of the tro])hi. 



The genera and s|)ecies of this family, including also the iVIa-Jarida;, 

 have been elaborately monographed by Dr. de Saussure, in his ad- 

 mirable *' Synopsis of American Wasps," ])ublished in 1875 by the 

 Smithsonian Institution, and which will be found to be indis[)ensil)le 

 to those desiring to study this interesting and beautiful group of in- 

 sects. 



The following table is about the best that can be offered at present 

 for the sejmration of the genera : ' 



Table of Genera. 



Abdomen jietiolate. 



Head large, quadrate, much expanded behind the eyes, making tl." cheeks 



broad; clypens broa(|er than long Zcthns Fabr. 



Head transverse, not expatided beln11*4^eyes. which almost entirely cover 

 the cheeks ; clyjMJUS longer ihan*ty«(t^l RiiiiicneN Latr. 



