OF WASHINGTON. 



153 



The families, according to their richness of species, may be 

 arranged as follows : 



Fam. Theridiidae, 21 genera, 83 species. 



LIST OF THK DKSCRIBKD SPECIES OF ARANE^E COI^ECTED IN THE DISTRICT 



OF COLUMBIA. 



The letters used before the dates signify as follows : A, found once only ; B, rare ; C, not 

 very frequent ; D, common ; E, very common. 



A Aug. 



A May. 



A June. 



A Aug. 



A Sept. 



Fam. 



1. Atypus abbotii Walck. near Bladensbnrg, 



Fam. THERAPHOSID^;. 



2. Pachylomerus audouini Luc. near Prospect Hill cemetery, 



3. Brachybothrium marxii Atk. Occoquan Falls, Va., 



4. robustum Simon. Occoquan Falls, Va. , 



5. Myrmekiaphila atkinsonii Simon. Fort Washington, 



Fam. 



6. Dysdera crocata C. K. D. C., under shelter, C all yr. 



7. Ariadne pallida C. K. Cabin John's Bridge, Potomac hills, C all yr. 



