Zool.— Vol. I.] BANKS— MEXICAN ARACHNIDA. 253 



E. prompta it varies in markings. Several from Tepic, 

 Coral de Piedras, El Taste, Sierra Laguna, and Sierra San 

 Nicolas. 



160. Epeira conchlea McCook. 



Epeira clavtspina Cambr., Biol. Cent. Amer. , Arach. Aran., p. 37. 



Larger than E. prompta, and with one or two cones at 

 the tip of abdomen; the epigynum broader at base. La 

 Chuparosa, Sierra Laguna, San Jose del Cabo, and Sierra 

 San Nicolas, July. 



161. Epeira prompta Hentz. 



Epeira parvida Keys, Beschr. n. Orbitel., p. 131. 



San Jose del Cabo, Coral de Piedras, and Tepic. 



162. Epeira detrimentosa Cambr. 



Plate XV, Fig. 7. 



Length 5 mm. Cephalothorax pale yellowish brown, clothed with white 

 hair; legs similar, with dark rings at ends of femora and tibiae, sometimes a 

 median ring on anterior femora and tibiae, and sometimes a brown stripe un- 

 der these joints; sternum pale brown, with a central yellow line; abdomen 

 grayish, with a broad blackish stripe on each anterior side, sometimes mar- 

 gined internally with a white line, mottled above with blackish, and traces of 

 a folium behind; venter blackish, with two spots and a band behind epigynum 

 yellow; the abdomen above is sometimes cream-white, showing four brown 

 dots, in one specimen it is greenish. Cephalothorax a little longer than broad. 

 M. E. equal, forming a quadrangle a little narrower behind than in front; P. 

 M. E. their diameter apart; sternum a little longer than broad, sides rounded. 

 Legs moderate; femora I a little shorter than cephalothorax, with quite long 

 spines. Abdomen globose, a little broader than long. The epigynum has a 

 striated finger, barely surpassing the circular cavity over which it rests. 



Sierra San Nicolas and Mazatlan. As it also occurs in 

 southern Texas the above description is given. 



163. Epeira helveola Cambr. — Determined by Dr. Marx. 

 One male; San Jose del Cabo. 



( 4 ) May 10, 189S. 



