598 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 93 



Host. — Gall of Disholcaspis globulus (Fitch) on Quercu-a steUata. 



Distribution. — Virginia. 



Remarks. — Known only from the single type specimen. 



TETRASTICHUS MARYLANDENSIS (Giranlt) 



Epitetrostichus m irylundcnsis Girault, Ann. Ent. Soc. Amer., vol. 9, p. 295,. 



1916.— Fennah, Rep. St. Lucia Agr. Dept for 1938, p. 35, 1939; for 1939, 



p. 25, 1940. 

 Epitetrastichus cunciformis Girault, Descriptiones stellarum novarum, p. 18j 



1917. (New synonymy.) 

 Tetrasfichus marylandensis (Girault) Fennah, Rep. St. Lueia Dept. Agr. for 



193S, p. 35. 1939; for 1939. p. 25, 1940. 



Body usually almost entirely yellow, with variable light brown 

 areas on head and thorax, transverse brown stripes on dorsum of 

 gaster, occasional specimens almost entirely brown; legs usually en- 

 tirely yellow, femora sometimes darkened; males usually entirely 

 brown, occasionally almost entirely yellow. 



Female. — Length, 1.0-1.85 mm. Apex of antennal scape not quite 

 reaching level of anterior ocellus, all funicle segments subequal in 

 length ; mesopraescutum with one row of bristles at each lateral mar- 

 gin ; submarginal vein of f orewing with three to five dorsal bristles ; 

 propodeum smooth, paraspiracular carinae wanting, spiracles touch- 

 ing anterior margin of propodeum, mesal length of propodeum one- 

 fifth as great as length of mesoscutellum ; gaster acutely pointed,, 

 longer than thorax. 



Male. — Length, 0.8-1.5 mm. Funicle segments bearing conspicu- 

 ously long setae near bases; gaster as long as thorax. 



Type locality. — Glenn Dale, Md. 



Type.—U. S. N. M. No. 19935. 



Hosts. — The host records for this species are somewhat confusing; 

 T. marylandensis is said to have come from various unidentified midge 

 larvae, as well as from the pine twig moth, Rliyacionia frustrana 

 (Comstock), the pine leaf miner, Exoteleia pinifoliella (Chambers) r 

 the corn leaf aphid, Aphis maidis Fitch, and eggs of various Lepi- 

 doptera and Coleoptera. Some of those records undoubtedly are 

 wrong. 



Distribution. — District of Columbia, Illinois, Maryland, Massachu- 

 setts, Mississippi, Missouri, Virginia. 



HOST LIST 



The following list contains the information at present available 

 concerning the hosts for the various species of Tetrastichus. These 

 hosts are heterogeneous, ranging from the Orthoptera to the Hyme- 

 noptera and Diptera, and include even some spiders. There is, also r 

 no uniformity in the particular stage of the host that is affected. 



