FAM. ELENCHID^E 4 3 



TABLE OF GENERA (Females) 

 ia. Mandibles not evident. 



2a. Opening of brood-canal a narrow transverse slit ; cephaloihorax 



rounded , r. Genus Deinelenchus, Perkins. 



2b. Opening of brood-canal broad, with a narrow curtain overhanging 

 it at base. 

 3a. Opening of brood-canal very broad, deeply cutting a rounded 



emarginatiou into thorax 3. Genus Mecynocera. Pierce. 



3b. Opening of brood-canal semicircular ; spiracles visible at 

 sides of the base of the head; cephaloihorax broadly 



cordiform 4. Genus Elenchoides, Pierce. 



lb. Mandibles elongate oblique, obtuse; cephaloihorax subquadrate; 



spiracles not prominent 5. Genus Pentagrammaphila. Pierce. 



I. Genus DEINELENCHUS, Pierce 



Deinelenchus. Perkins, Rep. Exp. St. Hawaiian Sugar Planters' Ass. Bull. 1, Pt. 3, pp. 107, 108 

 (igco); Pierce, Bull. U. S. Nat. Mus. no. 66, p. 170 (1909). 



Characters. — Male. — Head transverse, frontal process blunt, and not very prominent. Oral 

 cavity broad, semicircular. Maxillae two-jointed, sparsely pilose, the second joint narrower than the 

 first and in the form of a curved blade. Antenna? five-jointed, first joint elongate, second vers - short and 

 transverse, third long before its branch. Prothorax and mesothorax straight. Metathoracic prsescutum 

 elongate triangular, sides sinuate, apex rounded ; scuti narrowly separated by praescutum ; scutellum 

 transverse, with all sides sinuate; postlumbium transverse, of different consistenc}- from the other parts; 

 postscutellum equalling the remainder of the metathorax in length. Tarsi two-jointed. 



Female. — Cephalothorax nearly circular, very wide, the anterior margin simply and widely 

 rounded, with no denned anterior median area, and without evident tubercles in front. Mandibles not 

 evident. Between the opening of the brood-canal and the anterior margin there are two distinct areas 

 marked out by impressed lines, which run backward to the opening of the brood-canal, as deep grooves 

 on either side of a smooth slightly raised tubercle. Opening of brood-canal a narrow transverse slit. 



Type of genus. — D. australcnsis, Perkins. 



Geographical distribution of species. — Parasites of leafhoppers of the genus Plaiybrachys. 

 1. D. australcnsis, Perkins, Rep. Exp. Stat. Hawaiian Sugar Planters' Ass. Queensland. 

 Bull. 1, Pt. 3, pp. 107-109, pi. 3,f. 3.— PI. 3, Fig. 6; PI. 4, Fig. 7. 



D. auslralensis, Pierce, Bull. U. S. Nat. Mus. no. 66, p. 170 (1909). 



2. Genus ELENCHUS, Curtis 



Elenchus. Curtis, Brit. Ent. Vol. 8, p. 385 (i83i); Pierce, Bull.U. S. Nat. Mus. no. 66, p. 160 (ig°9)- 



Characters. — Male. — Head transverse, frontal process prominent. Antennae five-jointed, 

 first two antennal joints subequal, third laterally produced as a long flat appendage, fourth elongate 

 flattened, fifth twice as long as fourth and exceeding apex of third. Prothorax short, mesothorax longer. 

 Metathoracic scutellum small, postscutellum elongate. Wings having five primary veins from base, with 



