Superfamily Avicularioidea 



Professor Atkinson studied the species in North Carolina. 

 According to his observations the nest is of the cork door type, 

 and the tunnel may be either simple or branched. It is sometimes 

 made within an ants' nest; in which case the spider probably 

 feeds upon the ants. 



Myrmeciopbila atkinsoni (M. at-kin-son'i). — The second 

 species of this genus was found in Virginia. It closely resembles 

 the preceding; but differs in having the four anterior eyes closer 

 together, in the arrangement of the spines on the legs, and in 

 having the claws of the posterior tarsi armed with two teeth 

 at the base. 



Genus EUTYCH1DES (Eu-tych'i-des) 



This genus differs from the preceding in that the interior apical 

 angle of the chelicera? is rounded or slightly convex, and in that the 

 claws of the tarsi are furnished with several teeth near the base. 



Only one species has been found within the limits of the 

 United States. 



Eutychides versicolor (E. ver-sic'o-lor). — The adult female 

 measures a little more than one inch in length; the male is one 

 half as long. The endite of the pedipalp is armed with small 

 spines which are scattered from the base to the apex. 



This species has been recently studied by Mr. C. P. Smith 

 ('08) in California. He states that it is the most common trap- 

 door spider of the Santa Clara Valley, and of the foothills and 

 canons on either side. The burrow is long, narrow, branched, 

 and furnished with a thin trap-door of the wafer type. 



Genus AMBLYOCARENUM (Am-bly-o-ca-re'num) 



The fore tarsi are scopulate; the posterior sigilla are small 

 and much farther from each other than from the margin of the 

 sternum; the teeth of the rake of the chelicerae are numerous and 

 irregular; the anterior tarsi and metatarsi are short, robust, 

 and nearly equal in length; the metatarsi are unarmed except 

 by the apical spines. 



Only one species has been found in our fauna. 



Amblyocarenum talpa (A. tal'pa). — I have not seen this 

 species. It was described from a female, which was three fourths 

 inch in length. It occurs in California. This was first described 



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