62 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I25 



region, dorsal view, to show the X-shaped sclerite and the presence of 

 rectal scales. The larva was most easily related with the corresponding 

 pupa of the species by comparing the lateral thoracic histoblasts of the 

 former with the pupal respiratory structures they were to ultimately 

 form. 



TERMS USED IN THE KEYS AND DESCRIPTIONS 



Adults 



Buccopharyngeal apparatus. — That organ to which the proximal ends of the 

 hypopharynx and the labrum-epipharynx are attached. The dorsolateral parts are 

 produced as arms (cornuae) that are usually heavily sclerotized, serving as points 

 of muscle attachment. The median space between the cornuae may bear teeth, 

 the arrangement of which appears constant for a particular species. (Text fig. 2.) 



MdS 



Cor. 



Fig. 2. — Buccopharyngeal apparatus of female. MJ S, median space; 

 Cor., cornua. 



Calcipala. — A broad apical extension of the inner face of the hind basitarsus, 

 usually narrower than the distal margin of the latter ; it may be absent in some 

 species and very well formed in others ; its relationship to the pedisulcus appears 

 to be constant for any one species. (Text fig. 3.) 



Pedisulcus. — A split or break in the dorsal surface of the second hind tarsal 

 segment ; its position on the segment and degree to which it is marked appear con- 

 stant for any one species. (Text fig. 3.) 



Postnotum. — That plate of the thorax situated behind, and somewhat beneath, 

 the scutellum. 



Prescutellar region. — The posterior area of the scutum that is just anterior to 

 the scutellum ; usually clothed with pruinosity, and with pilosity that is longer 

 than that on other parts of the mesonotum. 



Pruinose or Pruinosity. — Covered with a fine dust or bloom, at times almost 

 metallic in luster, which obscures the base color of the region. 



Pupa (text fig. 8) 



Collar. — A raised portion of the cocoon between the base and the anterior aper- 

 ture which gives the cocoon the form of a "slipper." 



