726 BOSTON JOURNAL 



P. caudatus nob., notwithstanding their great apparent difference. 

 But this cannot be determined without more specimens, and a 

 better acquaintance with them both. 



Since the above was written, I have obtained many specimens 

 of this species, all corresponding in apparent sexual character, 

 excepting that in some the second joint of the antennae is so 

 far immersed in the first, as to be hardly visible ; still as it is 

 not, in any, much exserted, this character is probably dependent 

 on the greater or less degree of contraction in drying. 



CINETUS Jur. 



C. MELLIPES. — Black; feet honey-yellow. 



Inhabits Indiana. 



Body polished, black, hairy : antennae fuscous ; basal joint 

 honey-yellow ; vertex tinged with piceous : mouth obscure honey- 

 yellow : thorax with two impressed lines : wings immaculate, 

 ciliate ; nervures of the radial cellule extended a little towards 

 the base and centre of the wing ; the two anal nervures very 

 distinct ; stigma not obvious : abdomen, peduncle with longitu- 

 dinal, impressed lines ; second segment very large^ composing 

 the chief part of the abdomen : feet honey-yellow. 



Length one-tenth of an inch. 



BETH FLU S Latr. 



1. B. CELLULARis. — Black ; antennae, tarsi and anterior tibiae 

 piceous. 



Inhabits Indiana. 



Body black : head with a raised line passing between the an- 

 tennae before : antennae piceous : wings with a very [280] slight 

 tinge of fuliginous ; nervures yellowish ; stigma double, fuscous ; 

 a small, additional, triangular cellule at the tip of the brachial 

 cellules; abdomen polished : feet black ; tarsi and anterior pair 

 of tibiae and tarsi piceous. 



Length about one-tenth of an inch. 



This species is remarkable by the supernumerary cellule. 



2. B. MUSCULUS. — Black ; antennae and feet yellowish ; abdo- 

 men depressed. 



Inhabits Indiana. 



[Vol. I. 



