THE CANADIAN ENTOMOLOGIST 



189 



character of this area is, however, the presence of the well marked "cribriform 

 plates." (Fig. A). 



Cribriform Plates — (Fig. F). In this species the cribriform plates are 

 roughly oval or diamond shaped, with about thirty-four "pores" and in addition 

 a small stoma on the posterior edge. 



Affinities. This species is rather close to G. californicus from which it 

 may readily be separated by its larger size as well as numerous other characters 

 as may be seen by comparing with the brief redescription of the latter species. 



Material. A single adult female from Turtle Bay, Lower California, 

 Mexico, collected by the U.S.S. Albatross, April 20, 1906, and deposited in the 

 collection of the California Academy of Sciences, San Francisco, California. 



Remarks. The type is mounted on a slide in canada balsam and was 

 first boiled in KOH and stained. Mounting specimens in this way is apt to 

 destroy the shape of the spinnerets, but the numerous characters which are 

 gained more than offset this handicap. Many of the features noted in the 

 preceding description are invisible or practically so in any other form of mount. 



In the above description I have used several terms which it might be 

 well to explain. The "fixed finger serrula" referred to is a serrula-like set of 

 transparent teeth or serrations extending from the large seta at the junction 

 of the two fingers along the keel of the fixed finger almost to the basal tooth. 

 I have been unable to find any former mention of this character. It also appears 

 in G. californicus where it is very prominent. Its occurrence is very probably 

 generic as is also the characteristic arrangement of the five large dorsal setae. 

 (Figs. E. G and text fig. D). 



Garypus californicus (Banks). Female. 

 A — Third leg. IB — ^Cribriform plate. C — 'Pedipalp. D — Dorsal aspect of chelicera. 



At the base of the fixed finger of the chelicerae on both dorsal and ventral 

 sides, is a long slit-like opening, which, from its resemblance to a superficially 

 similar structure in plants, I have termed a "stoma." These stomata are char- 

 acteristic of all the species of the order which I have studied and are to be 

 found almost anywhere on the chitinized areas of the body, but more particularly 

 on the abdominal scutae. What they really are I have been unable to discover. 



