— 129 — 



I subjoin, for clearness a brief synopsis of his Classification. 



Suborder TerritelaricB. This was divided by Thorell into 3 families, 

 as tul lows: 



2, lung sacs < htadisoidai. 



4, lung sacs. 



a. With >ut spinnerets .... Liphinti idine. 



b. With spinnerets Tlterophosoiikr. 



I'lie family Theraf>hosoid&, Thorell, is further divided into three 



subfamilies as follows: 



Maxillae well broadened at the base, palpi inserted laterally,.. Atypinae Thorell. 



Maxillae little broadened at base, palpi inserted laterally, 



Eriodontinae Ausserer. 



Maxillae not broadened at base, palpi inserted on the end, 



Theraphosinse Thorell. 

 The ITie- phosince are then further divided into two groups, based 

 on the relative elevation of the caput above the thorax. 



a. Caput well elevated, Aepicephali. 



b. C iput not much elevated, Tapinocephali. 



In specific descriptions I have endeavored to not repeat characters 



which seem at present generic, so that in most cases it will require both 

 the generic and specific characters to identify a single species; for this 

 reason I have given the characters of the genus Pochylomerus, established 

 by Ausserer. 



Family THERAPHOSOIDAE, Thorell. 



Subfamily Eriodontinae, Auss. 



I. Genus Nidivalvata, n. gen. 



(nidus, nest, valvata having folding doors.) 

 (PL V, figs. 8, 9, 10, 13, 23.) 



Ceph'x little longer than broad; greater breadth at middle, tapering very gently 

 and equally to both ends; edges of posterior half slightly scalloped; small, deep, cir- 

 cular, depression in center from which radiate to edges of ceph'x 6 depressed lines 

 quite well marked. Caput well elevated, sloping to thorax gently, not broadly arched 

 as in MyrmekiaphUa. In front, caput gently drawn to a short blunt point about 

 which the eyes are crowded. Kyes can be better described by speaking of them as 

 being in three groups; the ant-centrals a diameter or less distant and situated at the 

 top and on sides of the hill; on each side of these, not far separated is a group of three 

 eyes forming a crescent with the concavity toward the middle group; the eyes in this 

 group nearly or quite touch each other. Fig. 8, PI. V, represents the eyes as seen from 

 the front at an angle of 45° to a plane parallel with the base of the ceph'x. 



With this view the ant- and post laterals form a trapezium, base at post- laterals 

 one-fourth larger than opposite side; height about one-third of base, postcentrals 

 slightly in front of base of trapezium. Ant-laterals comparatively large; others vary- 

 ing in relative size in different species, and it may be found, that the relative position 

 varies also as in Pachylomerus. Maxillae extended in from, but not so much as in 

 Eriodon. Fig. 10 represents a maxilla showing insertion of palpus. Labium Iriangu 

 lar, distal end rounded, longer than broad at base. Mandibles strongly kneed in front 

 of perpendicular clypeus. 



