358 Professor Williston on the 



species. It is witli much regret that I reduce the above 

 names to synonyms, for the worthy entomologist whose 

 name they commemorate deserves better at the hands of 

 his zealous confreres. 



There are now seven known species : — A. singidarisj 

 Towns. ; VanderwuJpia atrophopodoidesj Towns. ; V. 

 sequens, Towns. ; Microchira mexicanaj B. & B. ; Wuljpid 

 aperta, B. & B. ; and the ones described above- — all 

 markedly characterized by the rudimentary front claws 

 of the female, and having the general markings and 

 structure all very similar. No two, however, save per- 

 haps the two species of Vanderwulpia, agree in their 

 structural characters. Town send made the error, appa- 

 rently, of mistaking females for males, describing the front 

 claws as rudimentary in both sexes, while, without doubt, 

 in all the species they are alone rudimentary in the female.^ 

 Perhaps a grouping of the described characters will bring 

 out more clearly the value of those which have been 

 used for distinguishing the genera. 



Eyes hairy. A. singidaris, M. mexicana, A. Braueri. 



Frontal bristles descending to the cheeks. A. singu- 

 larisj A. Townsendi, A. Braueri. 



Frontal bristles not descending below antennae. V. 

 atrophopodeides, V. sequens, M. mexicana, W, aperta. 



First posterior cell open. A. Braueri, W. aperta. 



First posterior cell closed in the margin or short 

 petiolate. A. singularis, V. sequens. 



First posterior cell long petiolate. V. atrophopodoides, 

 A. Toiunsendi. 



Costal spine present. A. singularis, M. mexicana, 

 W. aperta, A. Toivnsendi, A. Braueri. 



Male claws normal. A. Townsendi. 



Male claws elongate. A. Braueri. (Other males un- 

 known.) 



Undoubtedly other mutations of these characters will 

 appear among species yet to be made known. 



I will add, that, in the two males of A. Townsendi, 

 there is a single, well-developed orbital bristle; in tho 

 males of A. Braueri, there are none ; in all the females 

 there are two. 



* Townsend has since recognized the males, and suspects that 

 Lachnomura, Towns., is also a synonym of this genus (Trans. Amer, 

 Ent. Soc, xxxii., 77, 1895). 



