166 Forty-ninth Report on the State Museum 



ing year. They showed a quite interesting form of attack, in which the 

 smaller leaves had been transformed into small, irregular, subovate 

 downy galls. These gave out their insects, which were found to be a 

 species of Di/hsis new to science and its description is herewith given. 



Description. 



DiPLOSis cucUMERis n. sp. Plate II. — Eyes black, coarsely granulate, 

 deeply emarginate anteriorly, and composing most of (he head. Vertex 

 with a small tubercle bearing a large curved seta; similar setae appear to 

 arise near the posterior margin of the eyes and curve anteriorly (fig. i). 

 Front dull yellowish. Male antennae over twice the length of the body, 

 each composed of fourteen segments ; basal two short ; the others much 

 elongated, and with a basal and a medial enlargement; basal enlarge- 

 ment subspherical and separated from the medial by a cylindrical shaft 

 of about twice its length and half its diameter; distal portion of the seg- 

 ment of the same size and a little longer (fig. 4). The medial enlarge- 

 ment is usually somewhat irregular, over twice the length of the basal, 

 and tapering proximally; each end constricted roundly to the naked 

 shaft. Bulbs or enlargements clothed with numerous short hairs and 

 bearing at the place of greatest enlargement whorls of long setae ; the two 

 longest of which on the dorsal side are two to three times the length of 

 an entire segment (shown in part at fig. 4, a, b), the others are about 

 half the length of a segment; on the larger bulb there is a submedial 

 whorl of shorter setre. There are also three whorls of arched filaments, 

 '■'•filets arques" which arise from pits in a similar manner to that of set^e. 

 From each pit arises single stems which quickly branch ; these bend and 

 recurve to the adjoining pits in the whorl where they unite with the stems 

 arising therefrom, and thus each whorl is a continuous structure extend- 

 ing around the segment. The components of the whorl of the basal bulb 

 vary considerably in length, most of them being but little longer than 

 the bulb itself (fig. 4, <?), though a dorsal one is prolonged to a length 

 one and a half times that of the segment (shown in part at fig. 4, c). 

 On the larger bulb there is a basal whorl of arched filaments about two- 

 thirds the length of the bulb (fig. 4, /), and at its apex another extend- 

 ing nearly to the tip of the segment (fig. 4,^), excepting the dorsal arch 

 which is prolonged to a length of twice that of the entire segment (shown 

 in part at fig. 4, d)* 



In the female, besides the two small basal segments, there are twelve 

 vase-shaped segments (fig. 3) ; pedicel distal, naked, and enlarged at 

 both extremities ; body of the segment gently rounded out and bearing 

 setae which in length are nearly equal to that of a segment and numerous 

 very small ones between ; the large setae show a tendency to form ill- 



*These arched filaments, yf/tf/j argues^ were described by Kiefter (Bte//. 7 des Seances Ent. Soc, 

 Fr., 189s, p. cxcii-cxciii). The same year Reuter {Acta Societatis pro Fauna et Flora Fennica. 

 xi, No. 8, i8q5, pp. 11-12) questions the accuracy of the description and thinks these processes to 

 be membranous lobes with thickened borders. The following' year Janet ( Bull. 7 des Seances Ent. 

 Soc. Fr., i8g6, pp. 183-185) supports Kieffer in his description of these processes, and advances a 

 theory to account for their development. If a membrane is present, it is extremely attenuated. 

 It is worthy of note that to all appearances these processes arise in the same manner as setae, 

 except for the anastomosis. 



In a preparation of the male antennae of Diplosis f>yrivora Riley, a number of the arched fila- 

 ments became loosened and escaped from their attachments but the anastomosis, where each arch 

 is joined to the base of the ne.xt, remained unbroken and distinct. In this preparation the com- 

 ponents of the arches may be seen diverging at various angles — another evidence in favor of 

 there being no connecting membrane. 



