1916] Malpighian Vessels of Haiti ca Bimarginata 401 



canal, the vessels again separate and bury themselves, ending 

 blindly beneath this coat." (Page 630). 



Schindler also recorded the condition of the vessels in Haltica 

 nemorum. "Leon Dufour has already pointed out that in 

 Donacia two pairs of winding 'gall-vessels' empty into a single 

 'gall-bladder' on the side of the stomach, while two other 

 isolated canals are inserted in the under part of the stomach. 

 A very similar condition is demonstrable in Haltica nemorum. 

 Here the first four urinary tubes — in this case blind-ended — 

 empty into a pyriform bladder. The bladder, which is only 

 a urinary bladder and not a gall bladder, measures 1.0 mm. 

 in cross section, and empties through a stalk (Stiel), the urethra, 

 almost 1.5 mm. long, into the upper end of the large intestine 

 (Mastdarm). * * * Shortly above this insertion two more 

 urinary tubes empty isolated into the pylorus. " (Page 631). 



While this account agrees in a general way with the condition 

 of \he tubes in Haltica bimarginata, it is very surprising to find 

 such great differences in species belonging to the same genus. 

 The bladder of bimarginata is proportionately smaller, and there 

 is no stalk at all. Admittedly this is a minor character; but 

 the fact that the vessels end distally in the wall of the colon 

 in the one species and blindly in the body cavity in the other, 

 is remarkable. Schindler makes no statement in regard to the 

 comparative length of the two series of vessels in nemorum, 

 and as he has evidently used the terms "large intestine" and 

 "pylorus" loosely, it is impossible from his description to make 

 an accurate comparison of the ventricular insertion in the two 

 species. 



In 1910 Poyarkoff published an article dealing with the 

 metamorphosis of another chrysomelid, Galerucella luteola, 

 in which he described the larval vessels. According to his, 

 statement, they are four in number and empty into the second 

 division of the hind intestine at the end of a comparatively 

 long coecum. (He recognizes four regions in the hind-intestine). 

 These four vessels after a long course through the body pass 

 into the wall of the colon, where two of them bifurcate, so that 

 there are six vessels associated with this portion of the intestine 

 (the third region). (Pages 337, 401-402 and 414). 



The condition described above is entirely different from 

 that in Haltica bimarginata, save that in the latter also there are 



