



DONISTHORPEA. 211 



Mymaridae : Litus cynipseus Hal. 



Diptera : Pseudacteon (Phord) formicarum Verrall, and Micro- 

 don mutabilis L. (larvae). 



Heteroptera : Alydus calcaratus L., Myrmecoris gracilis Sahib., 

 Nabis lativentris Boh., Myrmedobia coleoptrata Fall., Pilophorus 

 per plexus D. and S., and Systellonotus triguttatus L. 



Aphidae : Trama troglodytes Heyd., T. radicis Kalt., For da 

 formicaria Heyd., Pentaphis marginata Koch, P. trivialis Pass., 

 Geoica carnosa Buckt., G, formicina Buckt., Schizoneura corni F., 

 Aphis plantaginis Schrank, and Macrosiphum sp ? 



Coccidae : Lecanopsis formicarum Newst., Riper sia tomlini 

 Newst., E. subterranea Newst., R. formicarii Newst., and Ortheziola 

 vejdovskyi Sulc. 



Collembola : Cyphodeirus ( = Beckia) albinos Nicol. 



Araneina : Tetrilus arietinus Thor., Evansia merens Camb., 

 Micarisoma festiva O.K., Micaria pulicaria Sund., and Harpactes 

 hombergi Sep. 



Acarina : Cillibano comata Leon., Uroplitella minutissima Berl., 

 Trachyuropoda coccinea Mich, var sinuata Berl., T. laminosa Berl., 

 T. excavata Wasm., Antennophorus foreli Wasm., and Laelaps 

 vacuus Mich. 



Crustacea : Platyarthrus hoffmanseggi Brdt. 



Donisthorpea nigra L., var. alieno-nigra Forel. 



Lasius niger alieno-niger Forel Denkschr. Schweiz. Ges. Naturw. 26 46 47 

 (1874) 1 . Lasius alieno-niger Mayr Tijdschr. Entom. 23 26 (1880) 2 . Lasius 

 niger race alieno-niger Er. Andre Hym. Europe 2 194 (188 1) 3 . Lasius niger 

 var alieno-niger Dalla Torre Cat. Hym. 7 190 (1893) 4 ; Donisthorpe Ent. Rec. 

 25 63 (1912)5 : 26 39 (1914) 6 . 



Original description of L. alieno-niger Forel : 



" La pubescence des tibias, en se redressant, passe insensiblement aux polls. 

 Souvent un, deux ou trois polls seulement aux tibias et aux scapes. Dans 

 une fourmiliere les ^ sont plus claires, plus petites, moins pubescentes ; dans 

 1'autre c'est le contraire. Bref, cet intermediaire est presque aussi commun 

 que les formes ty piques." 1 



This variety is intermediate in size, colour, and the pubescence 

 on the tibiae and scape, etc., between D. nigra and D. aliena. 



In September, 1912, I discovered several colonies of alieno-nigra 

 at Weybridge situated in sandy banks which contained males and 

 winged females 5 , and in May, 1913 I found a colony under a stone 

 at Bletchington 6 . 



Hallett has sent workers to me from Cwrt-yr-ala in Glamorgan- 

 shire, and Harwood workers from Clacton-on-Sea, as well as males 

 and winged females from a marriage flight which he observed there 

 on October 12th, 1912. 



