404 ARANEIDEA. 
The type, 2, of A. aureus is identical with an example of A. americanus in the 
Keyserling collection, and it also agrees with his above-quoted figures*, made, 
presumably, from aczanowski’s type. The females labelled A. argenteolus by the 
Rev. O. P.-Cambridge, in the collection before me, also agree perfectly with the type 
of A. aureus. The type, ¢, of A. argenteolus is identical with the androtype, ¢, of 
A. aureus. There is no reason for supposing that these males and females are other 
than sexual complements of one species, or that Banks is correct in regarding A. larvatus, 
Keyserl., of which the type, ¢, is before me, as the sexual complement of 4. ameri- 
canus, Tacz. In any case, A. larvatus, 6, is quite distinct from both A. argenteolus 
and A. aureus, 3. 
Our figures of the vulva of the female A. americanus are taken from the example in 
Keyserling’s collection; those of the male are from the type of A. aureus. 
4, Argyrodes argenteo-maculatus. (Tab. XXXVIII. figg. 6, 6a, b, 3.) 
Argyrodes argenteo-maculata, O. P.-Cambr. Biol. Centr.-Amer., Arachn. Aran. i. p. 1938, t. 24. 
fige. 9, 9a-e(g)'. 
Type, ¢,in coll. Godman & Salvin. Total length 2°5 millim. 
Hab. Mexico, Teapa in Tabasco (H. H. Smith ?). 
The palpal organs of this species are so similar to those of A. americanus that one 
can scarcely separate them. ‘The abdomen is, however, distinctly different in form, 
but with so little material one cannot judge of the possible variability in this respect. 
I have therefore, for the present, treated these two forms as distinct. 
5. Argyrodes trigonus. (Tab. XXXVIII. fige. 7, 72,0, ¢; 8, 8a,b, 2.) 
Theridium trigonum, Hentz, Journ. Bost. Soc. Nat. Hist. vi. p. 280, t. 9. figg. 24 (9), 25 (¢)'; 
Spid. U.S. (ed. Burgess), p. 152, t. 16. figg. 24 (¢), 25 (¢), t. 19. figg. 117, 181 (¢) 
t. 21. fig. 14 (¢)*. 
Argyrodes argyrodes, Keyserl. Spinn. Amer., Therid. i. p. 181, t. 8. figg. 109, 109 a-c (¢) 
109 d(?)°* 
Argyrodes trigonum, Emerton, Trans. Conn. Acad. Sci. vi. p. 28, t. 5. figg. 1, 1a, 16, le (?), 
le,ld(g)*. 
Argyrodes bicornis, O. P.-Cambr. P. Z, S. 1880, p. 334, t. 29. fig. 12 (¢)’. 
3 
r] 
Type 3, gynetype 9, of A. trigonus, Hentz, non-extant; of A. bicornis, §, O. P.-Cambr., in coll. O. P.-Cambr., 
total length 4:5 millim. 
Hab. Nort America, United States '~4—Mexico, Omilteme in Guerrero (H. H. 
Smith).—BraziL, Parana ®. 
Emerton was the first arachnologist to give a recognizable figure of the species 
which he regarded as A. trigonus (Hentz)—published in Burgess’s edition of Hentz’s 
‘Spiders,’ and again in the ‘New England Theridide ’—this having previously been 
confounded with A. argyrodes (Walck.) (Ins. Apt. ii. p. 282) by several authors. 
Keyserling, however, perceived that the species which he ascribed to A. argyrodes 
