﻿Sept. 1895.] Packard. Scent Glands of Insects. 113 



closely similar to the long slender eversible hairy appendages or scent 

 organs of certain Arctian and Syntomid moths. 



I have found the external median wart with lateral lids or flaps in be- 

 tween the fifth and sixth tergittsof Platyzosteria iui^ens Scudder, a large 

 wingless Blattid living under the leaf scars of the cocoanut tree in South- 

 ern Florida, but was unable to detect them in Polyzosteria or in Bla- 

 bera from Cuba, or in another genus from Cordova, Mexico. 



In another group of Orthoptera, the Phasmidse, occur a pair of 

 dorsal prothoracic glands, each opening by a pore and present in both 

 sexes. In the walking-stick, Anisomorpha huprestoides, $ and 9 , these 

 openings are situated on each side of the prothorax at its upper anterior 

 extremity, situated at the bottom of a large deep pit. When seized it 

 discharged a "milky white fluid from the pores of the thorax, diff'using 

 a strong odor, in a great measure like that of the common Gnaphalium 

 or life everlasting" (Peale in Say's American Entomology, I, p. 84). 

 Boll states that the females when captured "spurt from the prothorax, 

 somewhat after the manner of bombardier beetles, a strong vapor, which 

 slightly burnt the skin ; when the females were seized by the males a 

 thick fluid oozed from the same spot." Scudder describes these 

 glands in another Phasmid (^Autolyca pallidicornis) as two straight, 

 flattened, ribbon-like bodies, with thick walls, broadly rounded at the 

 end, lying side by side and extending to the hinder end of the meso- 

 thorax. In Atiisomorpha biiprestoides the glands are of the same size 

 and shape (Scudder, Psyche, I, p. 137). In Diapheromera femorata 

 the repugnatorial foramina are very minute, and the apparatus within 

 consists of a pair of small obovate or subfusiform sacs, one on each side 

 of the prothorax, about i mm. in length, with a short and very slender 

 duct opening externally at the bottom of the pit (Scudder). 



In the Mantidae these seem to be genuine coxal glands, as there is 

 a pair situated between the coxae of the first pair of legs. An evagi- 

 nable organ like a wart, with a glandular appearance, occurs on the hind 

 femora of the Acrididae in a furrow on the under side into which the 

 tibia fits, about one-fourth from the base (Psyche, III, p. 32). 



In the male cricket, the anal odoriferous glands are small lobes 

 opening into a reservoir on each side of the rectum (Dufour). Homol- 

 ogous glands also occur in the Coleoptera and Lepidoptera, and may 

 prove to be coxal glands. 



Most Hemiptera or bugs send out a foetid or nauseous odor due to 

 a fluid secreted by a single or double yellow or red pear-shaped gland, 

 situated in the middle of the mesothoracic segment, and opening be- 



