CYDNIDAE OF THE WESTERN HEMISPHERE — FROESCHNER 413 



Length of body: 12.38(11.38-13.35). 



Female. — Similar to male but with posterior margin of sternite 

 VI with a marked impression between two bluntly conical pro- 

 tuberances; measurements rather similar to those of male. 



Head: Length-width ratio, 1.81(1.75-1.84) :2.72(2.60-2.8G) ; inter- 

 ocular width, 1.57(1.49-1.62). Antennal segments: I, 0.49(0.43- 

 0.53); II, 0.88(0.83-0.96); III, 0.81(0.73-0.85); IV, 1.28(1.16-1.33); 

 V, 1.33(1.16-1.46). Labial segments: I, 1.09(0.96-1.20); II, 1.42 

 (1.26-1.50); III, 1.21(1.03-1.30); IV, 0.89(0.80-0.96). 



Pronotum: Length-width ratio, 3.15(2.99-3.45) :6. 11(5.86-6.65). 



Scutellum: Usually longer than wide, 3.87(3.60-4.34) :3.80(3.73- 

 4.05). 



Terminalia: Ventral genital plates mostly convex. 



Length of body: 12.71(11.78-13.36). 



Type data. — Location of Burmeister's type is unknown. It was 

 described as from Para, Brazil. Walker's type (BrM) was described 

 from Orizaba, Mexico. Distant's (1900) type (BrM) was described 

 from "Costa Rica, Helechales." 



Specimens studied. — 21 males, 18 females, 3 nymphs. 



Mexico: Isthmus of Tehuantepec (labeled Pan^aews war^o). Nayarit: Tepic; 

 March. Sinaloa: Mazatldn; January. 



Panama: Alhajuelo; May. Barro Colorado Island; January. Boquete; 

 March, June. Bugaba. 



Colombia: Muzo, Department of Boyacd; July. 



Bolivia: 50 miles northeast of Cochabamba; August. 



Discussion. — Aethus fusiformis Walker has previously been 

 assigned to synonymy here by Distant (1880, 1899) and Signoret 

 (1881b), both of whom had examined the type in the British Museum. 



The assignment of opacus to synonymy under holomelas is based on 

 notes from Dr. China w^ho reported that the type, a female, has the 

 excavation between a pair of blunt tubercles on sternite VI. 



Ecttnopus muticus, new species 



Plate figure 101 



Diagnosis. — Either the short, third antennal segment or the 

 oblique, crenulate impressed line extending laterally from apex of the 

 osteolar peritreme (fig. 101) sets this species apart from the other two 

 in the genus. 



Description. — Based on a single specimen. Female: 

 Head: Length more than half width, 1.82:2.73; interocular width, 

 1.56; anterior outline subquadrate; surface impunctate, with a few 

 moderate oblique rugae. Antennal segments: I, 0.50; II, 1.13; III, 

 0.80; IV, 1.30; V, 1.46. Labial segments: I, 1.06; II, 1.66; III, 1.33; 

 IV. 0.76. 



