I have H. incei and C. ritae tarantulas in my collection I do not know how to id there sexes. For the H. incei, I have read that there is a size difference as well as a difference in leg color but I have not come across any pictures showing the difference. As for the Cyriocosmus species, the only information I have come across said the sex can not be determined until they have a mature molt. I assume one would look for male hooks or something similar but I have not come across that info.