CYDNIDAE OF THE WESTERN HEMISPHERE — FROESCHNER 619 



Hemely tron : Corium and clavus feebly alutaceous ; clavus with one 

 row of punctures; mesocorium with distinct punctures scattered over 

 disc and two complete rows paralleling claval suture; exocorium 

 punctured similarly or a little more closely than mesocorium; costa 

 with one setigerous puncture; membranal suture straight, lateral 

 angle not prolonged; membrane about as long as basal width, reaching 

 or slightly surpassing apex of abdomen. 



Propleuron: Shining, with few punctures ventrally in depression; 

 prosternal carinae less than half as high as labial II. 



Mesopleuron: Evaporatorium reaching into posterolateral angle but 

 not to lateral maigin; lateral area with seveial distinct punctures. 



Metapleuron: Peritreme abruptly terminated apically; lateral 

 margin of evaporatorium straight; lateral area mipunctate. 



Legs: Not specially modified. 



Sternites: Shining, impunctate except near apex of VI. 



Terminalia: Genital capsule distinctly punctate except medio- 

 apically, apical margin virtually straight; gonostylus as illustrated 

 (fig. 278). 



Length of body: 4.18(3.93-4.47). 



Female: Very similar to male. 



Head: Length-width ratio, 0.69(0.66-0.73) : 1.10(1.03-1.16); inter- 

 ocular width, 0.68(0.65-0.71). Antennal segments: I, 0.24(0.23-0.26); 

 II, 0.14(0.14-0.16); III, 0.30(0.28-0.33); IV, 0.35(0.33-0.37); V, 

 0.43(0.40-0.48). Labial segments: I, 0.38(0.36-0.40); II, 0.56(0.53- 

 0.60); III, 0.45(0.44-0.46); IV, 0.34(0.33-0.35). 



Pronotum: Length-width ratio, 1.17(1.10-1.33) :2.42(2.15-2.53). 



Scutellum: Length-width ratio, 1.49(1.36-1.63): 1.39(1.30-1.49). 



Length of body: 4.08(3.78-4.63). 



Type data.— Holotype male (USNM 64413) labeled "Colombia, 

 on Cattleya, intercepted Honolulu, VII-9-37," and allotype female 

 (USNM) labeled "Colombia, on orchid, intercepted San Francisco, 

 Cal., II-1-39." Paratypes: 4 males, 3 females, as follows: 



Panama: Summit, Canal Zone, January 1947, N. L. H. Krauss, 1 female 

 (USNM). 



Colombia: Bogotd, Nov. 30, 1921, F. H. B. #32857, 1 male (USNM). Inter- 

 cepted on orchids: Hoboken, N.J., Sept. 25, 1940, 1 male (USNM). Washington, 

 D.C., Jan. 13, 1940, 1 male (USNM); Nov. 14, 1936, 1 female (USNM); June 7, 

 1938, 1 male (RCF). San Francisco, Calif., Aug. 22, 1945, 1 female (USNM). 



Discussion. — The trivial name was given on the basis of the 

 numerous interceptions of this form on orchids. The several 

 specimens for which the host orchid was determined all came from 

 Cattleya, a tree-inhabiting orchid genus. This habit of frequenting 

 an orchid that grows on trees probably accounts in great part for the 

 fact that only two of the nine specimens seen had been collected in 



