January i 



PS J CHE. 



facts, but it seems as though if true, 

 there should be remnants of the 

 membrane observable in some of the 

 species. The insertion of the arched 

 filaments being so similar to that of 

 setae renders this theory not easy to 

 accept, though no better one can he 

 advanced. It is worthy of note in this 

 connection thatM. Kiefter has described 

 some small hyaline lamellae on the fe- 

 male antennae of the genus Monardia.* 

 At this time it may also be well to 

 call attention to certain structures in 

 tiie female antennae of at least one 

 species of Diplosis tiiat appear to have 

 been undescribed. On the enlarged 

 portion of the segment there is, as in 

 the male, a number of large setae and 

 the whole of the enlargement is thickly 

 clothed with a very sliort, minute pu- 

 bescence. In the female of Diplosis 

 sctigcra Liiitn. this pubescence is 

 absent along several longitudinal lines 

 which extend from the basal third of 

 the enlargement to near its apex ; at 

 the basal third these lines join a trans- 

 verse line of similar character, and at 

 the apex they are continued as diverg- 

 ing oblique lines over the edges of the 

 segment. These lines are studded with 

 large, transparent spots which in out- 

 line show themselves to be tubercles. 

 They are disposed along these cleared 

 lines at regular intervals, and some are 

 found scattered irregularly beside the 

 longitudinal lines. In spite of the few 



irregular ones, the others give a marked 

 appearance to the segment ; it would 

 seem as though these tubercles must be 

 some special sense organ. Similar 

 tubercles are found in D. pyrivora. 

 but they are larger and exhibit but 

 traces of the regularity of arrangement 

 seen in D. setigera, while nothing of 

 tiie kind occurs in D. ciicumeris, at 

 least with such striking distinctness, 

 and it is doubtful if they are present. 

 It may be that they are nothing more 

 than the pellucid spots seen on other 

 antennae which in D. sctigcra have 

 reached an extraordinary degree of 

 development and have been disposed 

 with more than usual regularity. 



The structures described above are 

 illustrated in the figures of plate i, 

 which have been reproduced from the 

 eleventh Report of the New 'b'ork 

 State Entomologist. Figure i repre- 

 sents the arrangement of setae (i), and 

 arched filaments («) in the male of 

 Diplosis sctigcra. In figure 4, the 

 same structures are shown on a segment 

 of Diplosis ciiciimcris : a, b represent 

 the basal portions of the much elongated 

 dorsal setae of the two bulbs ; c, </, the 

 basal portions of the similarly elongated 

 dorsal arched filaments; e, f, g, the 

 shorter arched filaments of the three 

 whorls. Figure 2 represents the pecu- 

 liar arrangement of structures on the 

 antennal segment of the female of D. 

 setigera ; two of which are shown in 

 outline at )',_)'. There is no figure 3. 



