1921] NATURAL SCIENCES OF PHILADELPHIA. ' 247 



To this genus belong the species described as Melestora minu- 

 tissima byRehn, fromlgarape-Assu, Para, Brazil, and as Melestora 

 micra by Hebard from Paraiso, Canal Zone, Panama. 



Genotype. — Ceuthobiella minutissima (Rehn) . 



The genus is closely related to Ceuthohia, described on page 292, 

 males agreeing in the comparatively slender form, interocular space 

 not Avrinkled, pronotum broadest meso-caudad with latero-caudal 

 oblique sulci moderately well defined but no trace of medio-longitu- 

 dinal sulcation, sinistral tegmen without a diagonal channel, wings 

 with radiate field folding fan-wise and dorsal surface of abdomen 

 with median segment specialized. 



It differs in the even smaller size,*^'' darker general coloration, 

 minute and inconspicuous ocelli, tegmina with discoidal sectors al- 

 most longitudinal," much narrower wings which are only slightly 

 over half as broad as long, scarcely appreciable costal veins which 

 are not clubbed distad, subobsolete intercalated triangle, sub- 

 genital plate more asymmetrical and showing a different type of 

 specialization and complete absence of genicular or other spines 

 on the femora. "^^ 



It would appear probable that Nothohlatta Bolivar (Mitth. Schweiz. 

 Ent. Ges., XI, p. 139, (1905).), including the single species, was- 

 manni Bolivar, belongs to the present group of genera and is nearest 

 to Ceuthobiella. From the literature, that genus apparently differs 

 in cephalic, palpal, pronotal, genitalic and tibial features. Un- 

 fortunately the description is vague concerning some of the most 

 important characters. 



Oulopteiyx meliponanun new species. Plate XV, figures 7, 8, 9 and 10. 



This striking species is first Blattid known to inhabit the nests 

 of bees. The series from which it is described was taken from the 

 nest of the diminutive, lilack, stingless bee, Melipona nigra Lepele- 

 tier. 



Compared with 0. dascilloides, described on page 215, the pres- 

 ent insect is seen to differ in the much paler brown coloration, 

 somewhat less coriaceous and much more hairy pronotum and teg- 



^2 The two described species are the smallest of the fully winged American 

 Blattidae known. Length of body, in normal position, approximately 4. .5 mm. 



^* Only the last of these toward the sutural margin is seen to be weakly oblique 

 to that margin. 



^^ The ventro-cephalic margins of the cephalic femora are supplied in distal 

 portion with a row of hairs, approaching the condition we term piliform spines. 

 (,from type of A. minutissima). 



