46 Mr. F. Pickard-CambrlJge — A Revision 



Dr. Frtedk. Dahl. " Monograpliie Erigonen-Arten &c.," 

 in Scliriften des naturwisseiischat'tlichen Vereins I'ul" 

 Sclileswig-Holstein. 1886. 



Centromeeus, Dablj Schrift. natur. Schl.-Holstein, Bd. vi. 

 p. 73 (1886). 

 Five, species were originallj included in tliis genus: — 

 (1) Micrj/pliantfs aqua/i's, C. K. ; (2) Neriene syh'atica, Bl. ; 



(3) Eriijoiie pibuIatrix^Q>-Amh\\; (4) Tmelicus illih ita^^'S'nn.; 



(4) N. vwntitna, Black \v\, = /iw?W«s, Sim. (Ar. Fr. v. p. 407). 

 So far as I can make out, none of these have been removed 



to new genera, nor can 1 find that tiie type has ever been 

 definitely selected. I therefore here select Xeriene sylvatica, 

 Blackw., as the type. 



Type, Centroinerus syJvaticas (Blackw.), 1841. — England. 



MacrarGUS, Dahl, Schrift. natur. Schl.-Holstein, Bd. vi. 

 p. 76(1886). 



One species only is here referred to this genus — Theridium 

 rvfum, Wid. 



Type, Macrargus rufus (Wider), 1834. — Europe. 



EUSTICIIOTHRIX, Dahl, Schrift. natur. Schl.-Holstein, Bd. vi. 

 p. 78 (1886). 



Two species were originally referred to this genus : — 

 (1) Theridioii sanguinolentuvi, Walck. j (2) Walckenaeria 

 obscura, Blackw. 



The tirst was already preoccupied as the type, being the 

 only species referred to it of JSeniatoymus, Simon, 1884. 

 Tlie second is therefore left in as the type. 



Type, Eustichothrix ohscurus (Blackw.), 1834. — England. 



MiCRARGUS, Dahl, Schrift. natur. Schl.-Holstein, Bd. vi. 

 p. 79 (1886j. 



Three species were originally referred to this genus : — 

 (1) Neriene Iterhigrada, Canibr., ni'spiint for Bhickw. ; 

 (2j Walckenaeria dicerosj Cambr. ; (3) Neriene lattbricola, 

 Cambr. 



I cannot find that any of these have been since referred to 

 new genera, although Simon has cited the last — latebricola, 

 Cambr. — as the type of his Gongylidiellum (Hist. Nat. Ar. ii. 

 p. 661), 1894). But this cannot, of course, stand, since Dahl 

 bad then broken up the genus and removed the species to 

 Micrargus. 



1 here select M. herhigradas (Blackw.) as the type. 



Type, Micrargus herbigradus (Blackw.), 1854. — England. 



