TAXONOMY OF TROMBICULIDS 
*55 
Unallocated species of Euschongastia 
See comments to unallocated species of Trombicula, p. 148. 
foliata-group : foliata , mccullochi, pseudomys, uromys. 
?lappacea-group : Pcassiope , edwardsi, lappacea, Pqueenslandica, womersleyi. 
?mohri-group ( ? Prelated to lacunosa- group) : crinita, mackerrasae , mohri, rectangulare. 
otomyia-group : aethomyia, otomyia , n. -sp. CORU 3711. 
raui-group: raui, innisfailensis ( = bushlandi syn); n. sp. Worn. & Audy in MS. 
?similis-group : dasycerci , derricki, perameles, similis. 
Ungrouped species. — Europe: Pberlesei. Africa: africana, alticola, annulata , Pbottegi, brevipalpis , 
capensis , causicola, gerrhosauri , kalaharica , laurenti , longispina, matoppoanus, monticola, ophicola , 
origensis, rhabdomyia, rhodesiensis , transvaalensis , tropidosauri, viperina. Asia & Pacific: antipodianum, 
bidentata, cairnsensis , coorongensis, echymipera, hirsti, ikaoensis , lipoxena , madagascanensis , melomys , 
peregrina , philippensis , samboni, samoaensis , setosa , trichosuri , westraliense. Also schlugen Rad. 
1953 (India), and kitajimai , F. & Ob. 1953. 
Genus Ascoschongastia Ewing, 1946 
Type. — Neoschongastia malayensis Gater, 1932:158, Parasitology , 24, 143-174. Apparently host- 
specific to the tree-living rat Rattus canus in Malaya. 
Diagnosis. — Trombiculids with the characters of Euschongastia whose larvae have the PL setae off 
the scutum. Nymph (of malayensis ) an undistinguished Euschongastia. 
Remarks. — This group may be clearly separated from Euschongastia sens. str. and it will 
doubtless accumulate related species around it — possibly even some with the PLs on the scutum. 
It would be consistent in this paper to treat it as a subgenus of Euschongastia but the present 
writer would hesitate to interfere again with this group, which has suffered a lot of taxonomic 
indecision. The relationships of the indica- group (p. 154) and of Pseudoschongastia to this 
genus should be particularly well studied. Nor should species be automatically placed in it 
only because they have expanded sensillae and PLs off the scutum. 
Old World species. — Africa: aethiopica. Asia: capillata , malayensis N, masta , “ NOV” n. sp. Worn. 
& Audy in MS. 
Genus Pseudoschongastia Lipovsky, 1951 
Type. — Pseudoschongastia hungerfordi Lipovsky, 1951:95, J. Kansas ent. Soc ., 24, 95-102. From 
small mammals in U.S.A. 
Diagnosis. — Trombiculids with the characters of Euschongastia whose larvae have PLs off the scutum 
and also legs II and III 6-segmented; so far all from the New World. 
Remarks. — This group seems to bear the same kind of relationship to Ascoschongastia 
as Walchiella bears to the E. lacunosa group. The writer believes that its affinities he with 
Euschongastia and not with any of the gahrliepiines (walchiines). He also believes that (a) its 
generic status requires more confirmation, but (6) it would be foolish to do anything but leave it 
as a genus at the present stage of fluidity in concepts. Opinions as to the relative value of 
characters such as displacement of the PL setae and the leg segmentation are almost entirely 
personal and have not yet been tested by time. The sister genus Walchiella is not related and 
has temporarily been accommodated as a subgenus of Euschongastia because it is not properly 
separable from the lacunosa-g roup. The new Malayan species noted under Ascoschongastia 
shows a very indistinct division of the femora of legs II and III in some specimens, and the 
present writer has not been impressed with this character while studying the oudemansi- and 
lacunosa-g roups. 
Genus Neoschongastia Ewing, 1929 
Type. — Schongastia americana Hirst, 1921 137, Ann. Mag. Nat. Hist., 17, 37-39. From various birds 
and a lizard. North and Central America. 
Diagnosis (after Wharton & Hardcastle, 1946 and Womersley, 1952). — Trombiculines of the 
Schongastia generic group with scutum submerged in the striated cuticle, sensillary areas usually below a 
transverse ridge; chelicers with only dorsal tooth and recurved ventral tooth; coxa III sometimes 
MALAYA, No. 26 , 1953 
