long's second expedition. 200 



TARPA Fabr., Le Pelletier. 



T. SCRIPTA. — Black, with white lines and spots ; abdomen ru- 

 fous. 



Inhabits North-west Territory and Arkansa. 



Hypostoma on its anterior margin, mandibles and palpi whitish ; 

 line upon the orbits extending from near the antennae [313] to 

 the occiput and together with an insulated spot each side on the 

 vertex when viewed from behind presenting the form of the 

 figure 3, white ; a white slightly oblique spot above the base of 

 each antenna; inferior orbits white : thorax with an abbreviated, 

 transverse, angulated line before, slightly interrupted in the 

 middle, a line before each wing and three small spots on the 

 middle placed triangularly, white ; wings hyaline, nervures fus- 

 cous ; feet yellowish-white ; abdomen rufous, first segment, and 

 sometimes the tip, black. 



Length from more than three-tenths to two-fifths of an inch. 



CEPHUS Latr. 



1. C. trimaculatus. — Black ; abdomen with a yellowish- 

 white spot each side at the middle. 



Inhabits Pennsylvania. 



Orbits before, two longitudinal spots on the hypostoma, and 

 base of the mandibles yellowish-white; wings brown-black ; me- 

 tathorax with a pale greenish, membranaceous, triangular spot 

 behind ; abdomen on the middle with a transverse oval pale yel- 

 lowish spot each side. 



Length % nearly one-half, $ nearly three-fourths of an inch. 



Yar. a. head immaculate. 



Var. 0. a very small indistinct spot on each side beyond the 

 middle. 



In the collection of Mr. William W. Wood, the great differ- 

 ence in point of size between the sexes of this insect, might 

 readily lead to error with respect to their specific identity. 



2. C. ABBREVIATUS. — Black; abdomen rufous at base. [314] 

 Inhabits Pennsylvania. 



9 Body black, polished ; labrum white, with a dilated, longi- 

 tudinal, fuscous line; thorax with an oblique, white, abbreviated 

 line at the base of the superior wings ; scutel with a transverse 



14 



