210 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxv. 



tufts is more prominent than any other and gives that species a char- 

 acteristic appearance. 



The legs are always stout and well developed, the anterior always, 

 the posterior usually without spinules or other than the normal arma- 

 ture. Middle tibiae always spinose, the spines varying somewhat in 

 number and prominence even within the limits of the same species. 



In examining some of the mounts of legs made in the course of the 

 preliminary work with lunata, I noted quite a diiference in tin 1 

 amount and character of the spinulation of the middle tibia and I 

 noted also that occasionally, on the hind tibia 1 , there would be one or 

 two distinct spinules between the two pairs of spurs. As this spinu- 

 lation is a structural character that has been given much systematic 

 value, it became important to determine whether there was not, per- 

 haps, a mixture of species and whether by separating out those with 

 the spines present on the posterior tibiae, it would not be possible to 

 correlate the structure with some superficial character. Every ex- 

 ample in all the collections then in my hands was therefore carefully 

 examined with the following results: 



The Ottolengui collection contained 21 males and 15 females, and 

 of the males 7 had the blue lunules distinct while 14 were of the type 

 in which the blue was reduced to narrow lines. Of the 7 males in 

 which the blue lunules were well developed, 2 had distinct spines on 

 the hind tibia'. Of the 14 males in which there were no blue lunules, 

 not one had any trace of such spinules. Of the 15 females, 7, or 

 nearly one-half, had distinct spinules on tin 1 posterior tibia?. In the 

 females there was no sort of correspondence between the depth of 

 coloration and the presence of the spinules, and in the males the per- 

 centage of spinose examples. 2 out of 21, was so small that no rule 

 could be even hinted at. 



In the collection of the U. S. National Museum there were 53 males 

 and 43 females, and of the 5:') males there were 25 with distinct blue 

 lunules and 28 in which the blue was reduced to lines. Of the males. 

 5 of those with blue lunules and of those with blue lines only had 

 the posterior tibiae spinulated. Of the females, 16 out of the 43 had 

 that character well developed. 



In my own collection I had 25 males and 33 females, and of the 

 males 10 had the blue lunules distinct, while 15 had only the blue 

 lines. Only one example with blue lunules had any trace of spines 

 on the hind tibiae. In the females, however, 13 out of the 33 examples 

 had one or two distinct spinules between the two pairs of spurs. The 

 females were separated out into two series; those with the median 

 -pace distinctly paler and those with the surface concolorous. and 3 

 of the spiued specimens were ranged among the former and 10 came 

 into the latter series. 





