OF WASHINGTON. 181 



was limited in its distribution to certain canons about Alamos. 

 He states that it is known as the Palo de la flecha, cuero de las 

 simellas, brincaderos, (Arrow tree which produces the jumping 

 bean). The plant exudes a good deal of milky juice, which is 

 what the Indians use on their arrow heads. He found the 

 plant in several places, but it is reported that the "jumping 

 beans ' ' are found only in an arroya near Alamos. It is not 

 easy to obtain- the infested capsules, because boys are always 

 on the lookout for them and gather them for sale, as they find 

 a ready market. He describes the shrub as a loose-growing 

 plant, five to eight feet high, the wood very hard, and the 

 milky juice readily crystallizing into a clear white brittle 

 substance. 



Professor Riley also called the attention of the Society to 

 some interesting anomalies in the following species. They are 

 two Noctuids, both from the same locality and both from a 

 rather small collection recently received, which show a short 

 ening of the wings on one side (the left) of the body. The 

 species are Agrotis pladda Grote and Agrotis introferens Grote. 

 In neither of these species is there anything to show that this 

 is due to gynandromorphism, as they are both females, with 

 no indication of male character on one side. The deformity or 

 aberration is undoubtedly due to chance. 



The other case is more interesting. It is a remarkable 

 bifurcation of the terminal joint of the left antenna in a speci 

 men of the common Cerambycid Tragidwn armatum. The 

 bifurcation is from the base of the joint, and in fact, the abnor 

 mal growth has all the appearance of a thumb growing out 

 from the base of the terminal joint, the thumb being somewhat 

 longer than the joint itself. 



Mr. Schwarz remarked in answer to an inquiry by Mr. Mann 

 that bifurcation of the antenna was not infrequent in Coleoptera 

 and may be of a single joint only, as in the specimens exhibited, 

 or of the entire antenna. 



Mr. Schwarz presented the following paper : 



