REVISION OF STEEPSIPTERA PIERCE. 165 



Type-genus. — Elenchus Curtis (1831). 

 Parasitic on Fulgoroidea. 



Antennae five-jointed, the third laterally produced, the fourth and 

 fifth elongate; tarsi two-jointed. 

 The family includes six genera: 



32. Elenchus Curtis (1831), parasitic on Liburnia; Europe. 



33. Elenchoides Pierce, parasitic on Perkinsiella; Fiji Islands. 



34. Mecynocera Pierce (1908), parasitic on Liburnia; America. 



35. Pentagrammaphila Pierce, parasitic on Pentagramma; America. 



36. Deinelenchus Perkins (1905), parasitic on Platybrachys; Aus- 

 tralia. 



37. Colacina Westwood (1877), parasitic on Epora; Asia. 



32. Genus ELENCHUS Curtis (1831). 

 Elenchus Hoeven, 1850. — Saunders, 1872. 



Name derived from Usyxos (anything pending), referring possibly 

 to the resemblance of the elytra to pendants. 



Type of genus. — Elenchus waTkeri Curtis (1829). 



The genus is parasitic on insects of the fulgorid genus Liburnia, 

 and in the present broad sense occurs in Europe, Asia, and America. 



This genus is typical of the family Elenchidse, having the antennas 

 5-jointed, the first two short, cup-shaped, the third laterally produced 

 as a long flat appendage, the fourth elongate flattened, the fifth flat- 

 tened double the size of the fourth and exceeding the apex of the 

 third. The tarsi are two-jointed. The wing venation consists of a 

 very short costa with a strong subcosta and radius on the costal mar- 

 gin, a detached outer vein between these and the medius, a long 

 medial vein with several small basal veins or folds on either side of it, 

 and one long anal vein. 



i. ELENCHUS WALKERI Curtis (1829). 



Stylops walkeri Curtis, 1829. 



Elenchus walkeri Curtis, 1831. — Westwood, 1835 b, 1840. — Saunders, 1872. 



Host. — Unknown. 



Localities. — Southgate and Dorset, England; Belfast, Ireland; June, 

 July. 



Male. — Length, 1.2 mm.; expanse of wings, 3.4 mm. 



The following description is revised from that originally furnished 

 by Curtis in 1831. 



Dull ochreous-fuscous; eyes black and shining; wings iridescent, pale fuscous, 

 costa and nervures darker fuscous; legs and antenna? pubescent (Curtis, 1831). Head 

 short, producing an obtuse lobe in front and a smaller one on each side. Eyes 

 remote, -lateral, globose, composed of about twenty hexagons. Prothorax short. 

 Mesothorax longer, with pseudelytron attached on each side, exceeding in length 

 the breadth of the mesothorax, clavate, slender toward the base. Metathorax large 

 and oblong, divided diagonally into four portions, the scutellum being the smallest. 

 84359— Bull. 66—09 12 



