170 THE entomologist's record. 



how it came to exist, though he thinks that it may have some gynan- 

 dromorphous characters. 



The specimen is extremely puzzling, and I don't feel at all sure 

 that I have fully succeeded in understanding it. I cannot detect in it 

 any distinctly female structures. I incline to believe that it belongs 

 to the same class of abnormalities as those that I showed'' resulted 

 from producing a small cicatrix between the 9th and 10th abdominal 

 segments medio-ventrally in the larval state. The result was that 

 structures developed fromHerold's corpuscle never came to the surface. 

 In the specimen before us PI. IV, fig. 1. (Fig. 2 shows normal appen- 

 dages of /ududis 3 ) the greater part of the clasps and the aedceagus 

 are still in the interior, but there is some confusion of parts, that I can 

 only explain by supposing that not only was the exit for these parts 

 blocked in some way, but that the organ of Herold, or perhaps before 

 it was formed, the tissue going to its formation, was in some way 

 injured or torn, or some portions lost. Thus we find the tegumen and 

 ring present, a little distorted, but practically complete. Comparing 

 figs. 1 and 2, we find (1) the uncus, (2) the scaphium, (3) the peniculus 

 (Pierce), and (4) a portion that I am not familiar with, and for which 

 I do not think Pierce has provided us with a name. The saccus is 

 also present, though obscured in the photograph by the density of 

 superimposed parts. As regards parts from the interior (Herold's 

 corpuscle), we have (9) a somewhat confused and dense mass, that 

 certainly contains the greater part of two clasps, and probably the 

 pupal covers of these and some irregularly developed portions, whose 

 eccentricities I ascribe to the original injury, whatever it was. Further 

 proof of this injury is found in there being only one clavus (5), the 

 other being absent, unless it is included in the confused mass of the 

 clasps, but if so it is quite undeveloped; I think there is little doubt it 

 is absent. The aedaagus is present (7), of almost normal develop- 

 ment, and the cornuti are within it in quite normal condition. 



The piece 8 pu/zled me very much, and I am not yet very positive 

 about it, but I believe it is a portion of the clasp, of what I think 

 Pierce calls the sacculus, at any rate the portion marked 8 in fig. 2. It is 

 not a torn portion of a developed clasp, but must have arisen from a 

 portion of the clasp separated whilst still hardly developed, as it has a 

 complete uninjured surface all over. The two curious organs (6) are 

 also difficult to understand. They are symmetrical and well developed, 

 yet there is nothing very like them in fig. 2. They seem to be portions 

 belonging to the ring, and not to any of the involuted portions forming 

 Herold's corpuscle. My experiments, already referred to, were made 

 in L. diapar, where the parts are simple as compared with Noctuac, so 

 that they do not help us here. I imagine they are parts not belonging 

 to Herold's corpuscle, but, remaining external, on the return of the 

 clasp to the surface become part of it. They are very close to 8 that 

 is probably part of a mutilated clasp, but whether they represent either 

 of the portions of the clasps, to which I have put a 6 in fig. 2, 1 cannot 

 say. 



I add as fig. 3 a figure of the $ structures, none of which appear 

 to be present in fig. 1. 



Trans. Ent. Soc. Lond., 1912. 



