120 IOWA ACADEMY OF SCIENCES. 



skull, No. 9 in the sketches, the inca bone is vertically divided into two by 

 a suture a little to the right of the median line. It is probable that if this 

 particular skull were placed in the hands of Dr. Gray he would consider the 

 "inca" bone enormously developed wormian bones. It seems to me, how- 

 ever, that there is a more natural explanation and one more in accord with 

 the facts. 



I have here the tabular portion of the occipital of a well advanced human 

 foetus. It is what would correspond to the supraoccipital of some of the 

 lower mammalia. The bone is cleft on each side, the fissure being just above 

 what will ultimately be the superior curved liue. Looking on the inside of 

 the bone, there are indications that at a still earlier stage of development 

 this bone was separated into two parts, the separation being along a line a 

 little above the superior curved line. This is exactly the condition of affairs 

 found in the skulls with the "inca" bone. In other words, we have in the 

 ordinary human embryo a condition of affairs which we find in the adult 

 skulls of these prehistoric people. It seems likely, therefore, that we have 

 here a persistent embryonic character. 



Unfortunately I was unable to find any satisfactory record of these 

 skulls in the catalogue of the Academy. Most of them were simply entered 

 by number. One was marked "De Kalb Co., lllr," and I was told that it 

 and several others came from prehistoric graves in that locality. 



If the "inca bone" was a characteristic of a definite race of human beings, 

 it would certainly be sufficient to constitute a new species of the Genus 

 Homo. If itfwas only an occasional, or even somewhat frequent abnorm- 

 ality, it may be regarded simply as a "reversion" indicating that the race 

 possessing it was of a peculiarly low type. 



NOTES ON THE DISTRIBUTION OF HEMIPTERA. 



BY HERBERT OSBORN. 



During the past few years I have received from a number of difterent 

 sources, partly by purchase and partly by sets sent me for determination, a 

 number of collections of Hemiptera, and as some of these records extend 

 the known distribution of the species, or give more specific data regarding 

 them, it seems desirable to give them a permanent record. 



The principal collections on which the paper is based, aside from my 

 own, are those made by Mr. Wickham in New Mexico, Arizona and Cali- 

 fornia, and in the northwest, and purchased by the Agricultural College or 

 by myself, those from Prof. C. P. Gillette, of Colorado, Prof. Lawrence 

 Bruner in Nebraska, Prof. V. L. Kellogg in Kansas, Dr. C. M Weed in New 

 Hampshire, and others. 



The Hemiptera present us with a number of interesting cases of distri- 

 bution. In some cases apparently dependent upon food plant, in others 



