214 ENTOMOLOGICAL SOCIETY 



The male (perhaps not quite adult) is smaller than the female, and the 

 abdomen does not extend much beyond the dorsal shield, and is much 

 narrowed behind; the sternal plate is of about the same shape as that of 

 the female, behind it there is a transverse line from each end of which 

 there extends back a short dark line; in the middle is an elongate pointed 

 genital opening. 



Length 9 2 - to 2.8 mm. ; $ 1.8 mm. 



Habitat Bronchial tubes of a seal (Monarchus tropicalis}. 



HALARACHNE Allman. 



Ann. & Mag. Nat. Hist., 1847. 

 H. halichceri \\\rc\. 



Ann. & Mag. Nat. Hist., 1847. Allman. 



Sitzungsber. d. Ges., naturforsch. Freunde zu Berlin, 1884, pp. 



57-64. Nehring. 



Zeitschr. f. Naturw., 1885, pp. 46-74. Kramer. 

 Zool. Anz., 1886, pp. 52-55. Haller. 

 Humbolclt (Dammer), 1889, p. 315. Nehring. 

 Habitat On Halichcertis grypkus. 

 H. americana, n. sp. 



Habitat On Monarchns troptcalzs. 



Dr. Hotter, who had seen the specimens taken from the dead 

 seal, stated that the air-passages were swarming with the mite, 

 which, however, did not appear to have been the cause of the 

 death of the seal. 



Dr. Gill suggested that Mr. Banks might, to advantage, ex 

 change the specific name americana to monarchi, from the genus 

 of the seal in which it was found. He objected to americana 

 for the reason that the host of the type species is quite as Amer 

 ican as the host of the new species. 



Mr. Banks objected to adopting the name monarchi, since the 

 genera of vertebrates no less than of arthropods are frequently 

 changed. 



Mr. Ashmead read a paper entitled " On the Genera of the 

 Xyelinae.* This was a technical paper giving the characteristics 

 of four genera of this group belonging to the fauna of the United 

 States and forming a distinct family Xyelidas, which he had 

 separated from the Tenthredinidae. These genera are Xyela, 



* Published in Psyche, Ma}', 1898, p. 214. 



