480 PROCEEDINGS OF THE NATIONAL MU8EUM. vol.54. 



43. Genus MEGALECHTHRUS Perkins. 



1. 3/. tryoni Perkins; parasite of Platyhrachys, species; Queens- 

 land. 



V. Superfamily ELENCHOIDEA Pierce. 



XL Family ELENCHIDAE Pierce. 



Considerable unstudied material in this family is at hand, but must 

 remain for future consideration. Until that time it is unnecessary 

 to prepare a table of genera. 



44. Genus ELENCHUS Curtis. 



i. E. tenuicornis Kirby; parasites of Liburnia^ species; England. 



2. E. walkeri Curtis ; host unknown ; England, Ireland. 



3. E. templetonii Westwood; host unknown; Mauritius. 



4. E. melanias Perkins; parasite of a Delphacid; Hawaii. 



4a. E. m. silvestris Perkins; parasite of a Delphacid; Hawaii. 

 It is quite probable that this is a composite genus, but nothing can 

 be done with it until the species can be studied. 



Errata: Gen. Insect., p. 4.3, line 35, for "p. 385" read "pi. 385." 



2. ELENCHUS WALKERI Curtis. 



Errata : Gen. Insect., p. 44, line 20. for " p. 385 " read " pi. 385." 



Dale (1841) records collecting males at Glenville's Wooton, Eng- 

 land, on June 27 and July 1, 1841. 



1. ELENCHUS MELANIAS Perkins. 



Elenchtis melanias Perkins, 1910, Fauna Hawaiiensis, vol. 3, pt. 6. Dec. 

 17, p. 667. 



Following is the original description : 



Thorax dull brown or pitchy, head black or nearly so, abdomen black, tips of 

 the joints of anterior ' tarsi pallid. Lateral branch of antennae extending 

 nearly to their tip, second joint subglobose or subquadrate in different aspects, 

 paler generally than tlie following. Wings very dark smoky black, apical 

 dilatation of elytra deep black. Abdominal segments with interrupted white 

 apical margins. Genital segment more or less pale within, rather broad where 

 the sides are well angulated in front of the middle, chitiuous recurved hook 

 dilated apically and terminated in a very minute pale upturned spine. Ex- 

 panse, 3.3 mm. ; length, 1.5 mm. Male. 



Errata : Pierce, Gen. In.sect., p. 44, line 7, after " pt. 6 " add " p. 667." 



4«. ELENCHUS MELANIAS SILVESTRIS Perkins. 



Very like the above, but with the wings less deeply smoke colored, and tlie 

 genital segment more elongate iu proportion to its width. This variety also 

 appears to be slightly smaller than the type. 



Hab. Oahu, Hawaii, and females on all the other islands. The typical form 

 described has been taken in more open country and the var. silvestris in very 

 dense, wet forests. It infests Delphacid leaf hoppers of many species and of 

 different genera. The var. silvestris approaches most nearly to E. tenuicornis, 



