Dendroblatta sobrina Rehn & J. A. G. 1916

Dendroblatta sobrina Rehn (Plate II, figures 12 anri 13.) 1916. Dendroblatta sobrina Rehn, Trans. Am. Ent. Soc, xlii, p. 232, pi. xiv, figs.
II to 14. [cf, 9 : Chinandega, Nicaragua; Pozo Azul. Costa Rica; Corozal and
Old Panama, Panama; Porto Velho, Brazil.]
Rio Trinidad, Panama, III, 28 to V, 5, 1911 and 1912, (Busck), 5cf , i 9, 4 juv.
Corozal, Canal Zone, Pan., II, 12, 191 1, (Busck), i 9 ; XI, 17, 1913, (Hebard; colony of adults and young on tree trunks in clearing, the Mantid, Litiirgousa cayennensis Saussure also there), 3d', i 9, paratypes, 2 small juv.
Old Panama, Pan., XI, 13, 1913, (Hebard; running about on surface of fallen tree trunk), i 9, paratype.
Panama. Pan., VI, 1915, (Harrower), i small juv. Chorrera, Pan., V, 2, 191 1, (Busck), i 9.
From the material at hand we would note that, in addition to the male genitalia features given in the original description, the dextral lobe of the subgenital plate is concave on its internal surface, covering a very thin chitinous plate of almost equal size, the distal margin of which is convex and armed with heavy curved dentiform spines. In part of the individuals examined this inner plate is concealed completely by the dextral lobe.
These beautiful insects were found to be remarkably agile, running with great rapidity over the tree trunks. When pursued, the adults sometimes took flight, but always returned to the tree they had just quitted. Both adults and young would at times suddenly arrest their movements, their striking coloration then blending astonishingly with the tree trunk upon which they were resting.
One female is at hand bearing an almost completely extruded ootheca, with suture laterad. The ootheca is very thin, subrectangulate in form, the dorsal and ventral margins showing very slight arcuation, approximately 6 millimeters long and 2.9 millimeters wide. The dorsal third is strongly compressed with margin (suture) bearing regular, well separated, small nodes, each of which shows a brief transverse ridge on its dorsal surface. The surface of the ootheca is microscopically very "finely and longitudinally substriate, giving a smooth bark-like appearance; the vertical divisions are subobsolete, about ten in number.
The young of this handsome insect are buffy, very strikingly marked with dark brown in a pattern of coloration very different from that of the adult (see plate II, fig. 13). It is interesting to note that this pattern, though having distinctive features, is in many ways much more similar to that found in Aglaopteryx gemma Hebard^^ and Aglaopteryx diapJuuia (F'abricius). We would further note the coloration of Aglaopteryx lita, here described, the adult of which species shows a type of coloration more suggcstivx^ of that of adults of the present species, than of the adults of the two other known species of that genus.
From these observations we may conclude that the general color type found in immatures of the present species and in adults of A. gemma and A. diaphana is very primitive, and that these genera thus show their common ancestral stock. Weight is added to the latter deduction by the discovery of A. lita, a species which has developed an utterly distinct color pattern, at least in the adult, from the other species of that genus, in some ways rather suggesting that of the present species.

Dendroblatta sobrina is a species of cockroaches in the family Ectobiidae. It was first described by James A. G. Rehn in 1916. It is found in Central America and South America.