SMITHSONIAN INSTITUTION 
UNITED STATES NATIONAL MUSEUM 
WASHINGTON, D. C. 
March 20, 1937 
Dear Dr* Schmitt* 
You apparently did not get the letter I sent you to Nassau* I 
mailed it at the post office myself last Monday, the 15th, hy air mail® 
I am sorry that it didn’t get there in time, although I guess it wasn’t so 
terribly important. It was mostly a blow-up of temper on my part. I was 
certainly hot under the collar after working out that key with Mr. Shoe- 
maker. 
As I said in my letter of the 15th, Callidactylus and Iliacantha 
cannot be differentiated on abdomens, because their abdomens are fused alike. 
However, when we got the specimens all out in a row, I saw that Callidactylus 
had three spines on either side of the front of the carapace, whereas all 
the Iliacanthas and the Leucosias had either one on either side of the front 
or none at all. Therefore, I made a key like this? 
B" 
Posterior half of carapace with seven spines. Anterior half of 
carapace with three spines on either side. ......... . Callidactylus 
Posterior half of carapace with not more than five spines, 
usually three or four. Anterior half of carapace with no 
spines or with one spine on either side. 
Posterior half of carapace with three snines. . . . . . . . Iliacantha . 
'• Posterior half of carapace with four spines 
(exceptionally showing trace of a rudimentary 
Tilth/...*............* ..... ..««• ... « « «... • • ..... JLtQUC 0 s i a • 
My letter of the 15th may catch up with you, so you’ll see the 
longer discussion I made there, but the above is essentially the same thing. 
The frontal spines are very pronounced in CaJLlid^fiftylus . and their absence 
in the other two just as clear, so I hope it is a good case. 
I got your note from Nassau on the 17th. How did it get up here 
so fast? I don’t remember that it was air mail, but perhaps it was. 
A few days ago Dr. Wetmore called Mr. Shoemaker upstairs to tell 
him to get a collecting outfit ready for the eclipse expedition. It seems 
that the expedition is all planned arid Kellers is not to go. It’s too bad. 
A Father Some-one from Georgetown University is going, and has never had any 
experience collecting. So we probably won’t get much. I wrote Dr* Kellers 
telling him the outcome, though I hated to do it. 
Margaret Van Winkle is coming down from Wellesley Thursday, April 
1st to stay with me until Monday, the 5th. I’m glad. She wrote that she 
hoped she would see you. She seems to do a good job of missing you with her 
visits. 
