SUB-FAMILY HYLOTOMINA. 47 



Sub-family HYLOTOMINA. 



Antennae 3-jointed, prismatic, cylindrical or hollow at sides ; two 

 basal joints small, third large. Wings with one radial cellule, append- 

 iculated or not, and three or four cubital cellules. Posterior wings 

 sometimes appendiculated, with two middle cellules. Lanceolate cellule 

 generally contracted. Larvse with eighteen or twenty eggs. 



The ocelli are varied, and there is a depression in 

 front of them. From this depression the front raises 

 to a more or less blunt point between and below the 

 antennae, reaching to near the mouth. On the top of 

 this ridge (which is margined) and before the antennas 

 is reached, there is often a fovea, which has a more or 

 less clearly defined margin, and is either triangular or 

 pear-shaped, or at least is broader above than below. 

 Clypeus truncated, or but slightly incised at apex. 

 Head concave behind. Episternum of mesothorax 

 oblique. Scutellum projecting over the metanotum, a 

 groove between it and the metanotum. Abdomen 

 with a distinct epipygium ; the hypopygium is varied 

 in form. Saws thick, broad, usually beset with cross- 

 bars. Tarsi with minute patellae. Tibiae often spined, 

 rarely without spurs (Pachylota). These when pre- 

 sent are simple. Maxillary palpi 6-, labial 4-jointed ; 

 labium 3-lobed. Mandibles thick, short, without inner 

 tooth. 



Wings with one radial and three or four cubital 

 cellules, the second or first and third receiving each 

 a recurrent nervure. Costal cellule wide, with a dis- 

 tinct cross-nervure, transverse cubital nervure often 

 dilated and curved. Transverse median cellule usually 

 received in middle of cellule. When the lanceolate 

 cellule is contracted the basal part of the accessory 

 nervure is often very short and difficult to see. In 

 the hind wing it is sometimes obsolete ; when present 

 it is, as a rule, appendiculated towards the middle. 



In the $ the antennae may be simple, and ciliated 



