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the labrum, besides about 10 cells, which may be gustatory structures, situated 

 on either side of a median setose ridge which passes back under the clypeal 

 region. 



The taste-cups of the leaf-beetles are fairly numerous, judging from an ex- 

 amination of Diabrotica vittata. The surface of the epipharynx is pilose, but 

 the median region is naked, and on the anterior half bears from 11 to 12 taste- 

 cups, arranged each side of the median line in a rude Y. On each side, at the 

 base of the labial region, are two sensitive fields, each bearing about 25 to 26 

 taste-cups. More were seen under the clypeus. 



In the Neuroptera unmistakable taste-cups are not always present. In 

 Sialis infumata along the median line of the epipharynx and near the front are 

 about 20 scattered gustatory pegs, which are minute, but longer and more 

 acute than usual. In Chauliodes maculatus there are one or two taste-cups 

 under the front edge of the clypeus; others are scattered along the middle 

 from the base of the labrum to the front, but are not arranged in definite order. 

 In Corydalis cornutus no sense-cups, pits, or rods are present. In Chrysopa 

 there are scattered cups armed with a short acute bristle, which are possibly 

 gustatory in function. In Myrmeleon diversum also the presence of sense-pits 

 or of taste-cups is doubtful, though a group of about 12 pits on each side of the 

 clypeal region of the epipharynx, and a few situated at the base of the labral 

 region, may be endowed with the sense of taste. In Mantispa brunnea, how- 

 ever, along the middle of the epipharynx are scattered about 30 unmistakable 

 taste-cups, each bearing a short, fine hair. 



In the Mecoptera (Panorpa debilis ?) taste-cups, giving rise to a minute hair, 

 occur on the labium in two regions, and also on the maxillae situated on the 

 stipes near the base of the palpi, and on the lacinia and galea. They are also 

 to be found on the maxillae of Boreus californicus, but were not detected on the 

 labium. 



They were first detected by Reuter in various microlepidoptera, and occur on 

 the" basal spot" of the palpi of many butterflies. In a Tineid moth (Coleo- 

 phora coruscipennella) we have detected what we suppose to be a group of four 

 taste-pits on the inner side of the basal joint of the labial palpi. 



Experimental proof. No one, says Lubbock, who has ever watched 

 a bee or wasp can entertain the slightest doubt as to their possession 

 of the sense of taste. " Forel mixed morphine and strychnine with 

 some honey, which he offered to his ants. Their antennae gave them 

 no warning. The smell of the honey attracted them, and they began 

 to feed; but the moment the honey touched their lips they perceived 

 the fraud." 



Will at first fed wasps with sugar, so that they frequently visited 

 it; afterwards he substituted alum for the sugar. Eagerly fly ing i<> 

 it, they had scarcely touched it when they drew back from the dis- 

 tasteful substance with the most comical gestures, and cleaned their 

 tongues by frequently running them in and out, repeatedly stroking 

 them with their fore feet. He noticed a great repugnance to qui- 

 nine in nearly all the insects experimented on. Bees and wasps 

 were observed to have a more delicate gustatory sense than flics. 

 etc., which are more omnivorous in their tastes. 



