No. 1.] ATTID.E OF CENTRAL AMERICA. 81 



equally wide in front and behind, is only one-fifth wider than 

 long and occupies fr'om two-fifths to one-half of the cephalo- 

 thorax. The anterior ej^es are nearly' touching, i n a straight row, 

 the middle being almost twice as large as the lateral. The sec- 

 ond row is nearer the first than the third. 



This genus belongs to the Marptusa Group. The outline 

 of the sides resembles Fseudicius, and some of the species of 

 Balmaceda, but it is not fiat enough to be included in these 

 genera, the contour of the upper surface being more like Mene- 

 merus. 



The type is (Alius) Dyhowsldi, Taczanowski, described in Les 

 Araneides de la Giiyane Fancaise, p. 65. The type species was 

 sent to us hj Dr. Taczanowski, marked Eaoplirys Dyboivskii. 



I'ACHOMIUS DYBOWSKI, TACZ. 



Plate YI, figs. 7-7d. 



S . Length, 6. Length of cephalothorax, 3 ; width of 



cephalothorax, 1.8. 

 5 . Length, 8.5. Length of cephalothorax, 3.6 ; width of 



cephalothorax, 2. 

 Legs, (? 4132 ; ? 4312 ; first and second pairs stoutest. 



A medium-sized species, having the abdomen red, with 

 white spots. 



The clypeus is fully half as high as the anterior middle 

 eyes. The falces are vertical and moderately stout, narrowing 

 toward the extremity. They are as long as the face in the 

 male, and a little shorter in the female. The legs of the male 

 are longer than those of the female. The quadrangle of the 

 eyes occupies two-fifths of the cephalothorax, and is a little 

 wider behind than in front. 



The cephalothorax of the male is dark brown or black. A 

 wide white band runs around the sides and across the clypeus 

 there is a large white spot on each side of the cephalic part 

 between the second and third rows of eyes, and an elongated, 

 central spot on the thoracic part. The color of the abdomen 



