48 GENUS HYLOTOMA. 



or pilose, or the third joint may be cleft at the base 

 into two equal branches. 



This is a very distinct sub-family, the structure of 

 the antennae alone serving to distinguish it. The sub- 

 family is represented in all parts of the globe, includ- 

 ing Australia. A fossil species has been recorded from 

 the Tertiary Strata. 



Thomson divides the Ey 'lot omina into two sub- tribes 

 the Hylotomides, with the posterior tibiae spined 

 and the radial cellule appendiculated, and the Schizo- 

 cerides, with no spines on tibiae and radial cellule not 

 appendiculated, the latter too having the antennas 

 furcate in the males. 



Genus HYLOTOMA . 



Hylotoma, Latr., Hist. Nat., iii, 302 (1802). 

 Arge, Schrank, Fauna Boica, ii, pt. 2, 226 (1802). 



Radial nervure appendiculated ; four cubital cellules, the second and 

 third receiving each a recurrent nervure ; lanceolate longly contracted. 

 Basal nervure interstitial. Posterior wings appendiculated and with two 

 middle cellules. Antennae situated not far from the top of the eyes ; 

 simple in <, ciliated ; often grooved in ? . Four posterior tibia3 spined. 



The mandibles are broad, with a curved outer edge 

 and a blunt apex. The labial palpi have the two 

 middle joints thicker and a little longer than the 

 others. The basal three joints of maxillary palpi are 

 of a denser texture than the three apical, and they are 

 also thicker. The first is a little shorter than second, 

 which is ^about half the length of third; the three 

 apical become gradually longer. Blotch large ; claws 

 simple. 



This is an easily recognised genus, its only Euro- 

 pean ally (Schizocera) being easily distinguished from 

 it by the radial cellule not being appendiculated, and 

 by the posterior tibiae not being spined, while its <$ is 

 well marked by the cleft antennas. The larvse have 

 from eighteen to twenty feet, and have the body gene- 

 rally beset with tubercles, each ending in a bristle. 



