124 Psyche [August 



Measurements of holotype: Length 3.02 mm.; head, length .576 mm., width 

 .293 mm.; prothorax, length from anterior angle to base .288 mm., width (inclusive 

 of coxa?) .564 mm.; pterothorax, width .600 mm.; abdomen, width .576 mm.; 

 tube, length .252 mm., width at base .093 mm., al apex .054 mm. Antennal seg- 

 ments: 1, 72/i; 2, 84/*; 3, 231/r, 4, 171/*; 5, 159/*; 6, 96/*; 7, 81/*; 8, 42/1; total length 

 of antenna, .93 mm.; width at segment 3, .048 mm. 



Male: Smaller and slenderer than female (length about 2.8 mm.). Eyes larger, 

 very pi'ominent. Antennae longer and more slender. Terminal abdominal bristles 

 one and one half times as long as tube. Otherwise nearly as in female. 



Measurements: Length 2.83 mm.; head, length .540 mm., width across eyes .270 

 mm.; prothorax, length from anterior angle to base .240 mm., width (inclusive of 

 coxse) .420 mm.; pterothorax, width .468 mm.; abdomen, width .420 mm.; tube, 

 length .252 mm., width at base .093 mm., at apex .054 mm. Antennal segments: 

 1, 72/*; 2, 84/*; 3, 231/*; 4, 174/*; 5, 16.5/*; 6, 117/*; 7, 87/*; 8, 48/i; total length of 

 antenna, .98 mm.; width at segment 3, .045 mm. 



Described from one individual of each sex, taken in sweepings 

 near Paraiso, Canal Zone, Panama, by Mr. James Zetek. 



This anomalous insect differs from its congener silvestrii, de- 

 scribed from Argentina, in several important particulars, the most 

 noticeable being the absence of spiniferous genal tubercles, the 

 deeply emarginate pronotum, the abdominal coloration, and the 

 size. Minor additional differences may also be noticed in the form 

 of the head, the length of the eyes, the comparative lengths of the 

 third, fourth, and fifth antennal segments, and the lengths of 

 the antennal sense cones and the prothoracic bristles. The com- 

 pressed dorsum of the head is normal and especially interesting, 

 occurring to the best of my knowledge in no other species. Another 

 remarkable point of structure, and which was not mentioned in 

 the original generic description, lies in the mode of insertion of the 

 antennae, these being attached to the ventral surface of the head 

 and in life apparently directed diagonally downward, nearly at 

 right angles to the top of the head. The emargination of the 

 pronotum allows the head to be tipped back at an angle of about 

 forty-five degrees. 



