436 U- S. NATIONAL MUSEUM BULLETIN 216 



more yellowish brown; the yellow markings on the head and thorax 

 more extensive and less definitely limited; the antenna ocliraceous ; 

 the wings suffused with yellowish brown and with darker brown spots 

 or mottling; and the abdominal markings differing as follows: First 

 and second tergites of male without a preapical yellow band; first 

 tergite of female without a preapical yellow band or rarely with a 

 small one; third and following tergites of female with large lateral 

 yellow blotches (in place of the subapical yellow bands of the sub- 

 species lunator), the blotches progressively larger toward the fifth and 

 sixth tergites. 



Specimens (34 d" , 369) : From Arizona (Manzanita Camp in Oak 

 Creek Canyon and Prescott) ; Colorado (Durango at 6,500 ft.) ; New 

 Mexico (Jemez Springs at 6,400 ft., Las Vegas, and Mesilla Valley); 

 and Utah ("Beaver Canyon," Provo, Salt Lake City, and Vernal at 

 5,300 ft.). 



This subspecies occurs in Utah, Arizona, and parts of Colorado and 

 New Mexico. 



Subfamily Xoridinae 



Figures 304,b-307,b 



Front wing 2.8 to about 25 mm. long; apical margin of clypeus 

 truncate or somewhat concave medially, or thin and rather strongly 

 convex; labrum semicircular, mostly exposed when apex of clypeus 

 is truncate or concave, otherwise with only its apex showing; pro- 

 podeum more or less completely areolated, the costula usually pres- 

 ent; tarsal claws simple or rarely in the female with a large basal 

 tooth; first sternite completely fused with its tergite and sometimes 

 the vestige of the suture obliterated; first tergite without a glymma, 

 straight, deeurved, or upcurved, its spiracle near, in front of, or 

 rarely behind its middle; epipleura moderately wide to very wide; 

 apical half of abdomen cylindric; female subgenital plate weakly 

 sclerotized, transversely rectangular, usually membranous medially. 



The larvae of this subfamily are similar to larvae of the subfamily 

 Gelinae. The antenna is well developed, mandible rather large and 

 with fine teeth, and the sclerotic spur of the hypostoma reaches the 

 stipital sclerite before its apex, which is upcurved beyond the point 

 of contact with the sclerotic spur. 



The subfamily Xoridinae includes a small number of rather dis- 

 tinctive genera, which are distributed in five small tribes. Because 

 of their structural diversity and their scattered geographic distribu- 

 tion they seem to be relics of a group that once was much larger and 

 more homogeneous. The affinities of some of the genera, particu- 

 larly Labium, Poecilocryptus, and the Brachycyrtini have been the 



