Dec., '09] F.XTOMOLOGTCAL NEWS 413 



PROSOPIS. 



Of the five species of Prosopis enumerated in this paper 

 four occur also in the northeastern states, while one, P. minyra, 

 is described as new. If specimens of Prosopis with yellow 

 markings are left too long in the cyanide jar the yellow marks 

 change to red. Even dried specimens, if exposed to the action 

 of cyanide of potassium, will undergo a similar change. The 

 yellow coloration of some species of wasps under these condi- 

 tions also becomes red. Such artificial color changes, if un- 

 known, might easily lead to mistakes in identifications. 



Prosopis pygmaea Cr. 



9 . Falls Church, Ya., May 30. on flowers of Castanca 

 pnmila, June 22, July 6, on flowers of Ccanothns, N. Banks. 



Prosopis verticalis Cr. 



As the female has never been described it is deemed desira- 

 ble to give the more important characters : 



5 . Length about 6mm., larger than the male which it closely re- 

 sembles. Deep black ; the bow-shaped marks on each side of the face 

 and the tubercles are yellow (the collar and tegulae are dark) ; the an- 

 terior and intermediate legs wholly black, the posterior legs have the 

 tibiae yellow at base. Head longer than broad, the clypeus is distinct- 

 ly but sparsely punctured, the face closely and evenly punctured. Meso- 

 thorax opaque, the punctures small and very evenly distributed. Wings 

 nearly hyaline, stigma and nervures fuscous. Enclosure of metathorax 

 well-defined, irregularly and finely reticulated (in the male the rugae 

 are more nearly parallel). The first abdominal segment is smooth and 

 shining, with patches of white pubescence on the apical lateral margins. 



Two females collected at Falls Church. Ya., on May 24 ; 

 one male at Falls Church, Ya.. May 24, \ T . Banks. 



Prosopis minyra n. sp. 



$. Length about 4 mm. The clypeus, supraclypeus and the sides 

 of the face are yellow; the upward extensions of the lateral face marks 

 are short and obliquely truncate ; two spots on the collar and the tuber- 

 cles, the anterior tibiae in front, the intermediate tibiae at base and aju-x 

 (slightly), the posterior tibiae at base and all the tarsi, yellow. Head 

 about as broad as long, the face narrowed below, the punctures of the 

 face and mesothorax are close and small. Antennae black, the scape 

 normal, the flagellum is fuscous in front, light brown -behind. Wings 

 nearly hyaline, iridescent, the nervures and stigma are fuscous, the 



