GENUS HEMICHftOA. 3 



1 (4) Fore wings with two radial cellules. 



2 (8) Lanceolate cellule contracted. Hemichroa. 



3 (2) Lanceolate cellule petiolate. Dineura. 



4 (1) Fore wings with one radial cellule. 



5 (8) Lanceolate cellule contracted. 



6 (7) Fore wings with the first transverse cubital nervure generally 



obsolete, second (or first if the transverse cubital nervure is 

 absent) and third receiving each a recurrent nervure. 



Cladius. 



7 (6) Fore wings with the first transverse cubital nervure distinct, 



second cellule receiving both recurrent nervures. 



Camponiscus. 



8 (5) Lanceolate cellule petiolate. 



9 (10) Posterior tibiae at apex and base of tarsi compressed and 



dilated. Crcesus. 



10 (9) Posterior tibiae and tarsi not compressed or dilated. 



11 (12) With three or four cubital cellules, of which the first is large 



and receives both recurrent nervures if there are only three 

 cellules, and the second if four cellules are present. 



Nematus. 



12 (11) "With three cubital cellules, of which the first is always small 



and the second receives both recurrent nervures. Euura. 



Genus HEMICHROA. 



Hemichroa, Ste., 111., vii, 55 (1835). 

 Leptocerca, Htg., Blattw., 228 (1837). 



Wings with two radial and four cubital cellules, the second of the 

 latter the longest and receiving both recurrent nervures. Lanceolate 

 cellule constricted. Posterior wings with two middle cellules. 



Antenna longish, filiform ; the third and fourth joints equal in 

 length. Calcaria as long as half the metatarsus. Cerci long, stout. 

 Clypeus incised at the apex. 



The mandibles are weak ; the apical tooth longer 

 than one half of the total length, and moderately 

 sharply pointed. The labial palpi are of moderate 

 length, thickish, the 'first joint the shortest, the third is 

 a little longer than it, and shorter than the second and 

 fourth ; the basal joint of the maxillary palpi is a little 

 more than half the length of the second, and about 

 one half shorter than fourth, which is longer than it, 

 but shorter than the last two, which are the longest 

 and, as well as the fourth, are thinner than the basal 

 three joints ; the last is a little shorter than the pre- 

 ceding. The inner lobe of maxilla is broad at the 

 base and tapers to a sharp and long point at the apex, 



