1921] NATURAL SCIENCES OF PHILADELPHIA. 257 



tion of scapular field transparent, feebly tinged with buff, thence 

 becoming suddenly rich chestnut brown, which gradually becomes 

 more dilute distad and toward the costal margin and is there weakly 

 tawny. Wings almost clear hyaline, showing a very faint tawny 

 tinge toward the free margins of the anterior field and with enlarged 

 portions of costal veins white. Abdomen with dorsal surface to 

 sixth tergite blackish brown, narrowly margined laterad with och- 

 raceous-buff, except that the sixth has a suffusion of blackish brown 

 on each side. Cerci chestnut brown, shading to prouts brown dis- 

 tad and narrowly buffy proximad toward the internal margin. Ven- 

 tral surface of thoracic segments and bases of trochanters chestnut 

 brown, limbs light ochraceous-buff. Ventral surface of abdomen 

 with lateral margins ochraceous-buff, proximad and laterad black- 

 ish brown, this leaving the median portion of the mesal section and 

 all of the distal portion ochraceous-buff. 



Length of body 9.7-9.3,'*^ length of pronotum 2.7-2.7, width of 

 pronotum 3.7-3.6, length of tegmen 10.3-9.9, width of tegmen 3-3 

 mm. 



In addition to the type, a paratypic male, bearing the same data, 

 is in the Hebard Collection. 



Dasyblatta chopardi" new species. Plate IX, figures 6, 7 and 8. 



This interesting species is distinguished from the genotype, D. 

 thaumasia, described on page 225, both known only from the male 

 sex, by its smaller size, pale coloration, much wider interocular 

 space and striking genitalia. 



The genitalic specialization in these species is seen to represent 

 a distinctive type, the two agreeing in general character of develop- 

 ment. 



Type: cf ; Colonia Florencia, Rio Tapenaga, Chaco, Argentina, 

 [Paris Museum.] 



In addition to the characters given in the generic description on 

 page 224, the following are considered of specific value. Inter- 

 ocular space slightly over one-half occipital ocular depth, three- 

 fifths that between antennal sockets; impressed punctae, the sockets 

 of hairs, particularly conspicuous in the inter-ocular-ocellar area. 

 Third joint of maxillary palpi four-fifths as long as the large fifth 

 joint, slightly longer than the fourth joint. Hirsute tegmina sub- 

 coriaceous in appearance, due to the fact that the hairs are invisible 

 except under the microscope; area of dextral tegmen, concealed 

 when at rest, hairless; discoidal sectors (9-10) best termed longi- 

 tudinal, though toward the sutural margin the last of those in the 

 sinistral tegmen is weakly oblique to that margin, while toward the 

 sutural margin several in the dextral tegmen are slightlj^ irregular- 



^^ The measurements of the type are given first. 

 ''"' In honor of our friend. Dr. Lucien Chopard. 



