1881.] NATLTIAL SCIENCES OF PHILADELPHIA. t5 



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Fig. 51. After Lubbock. Section through the head of Lasius 

 niger^ to show site of buccal sac, he. s, the pharynx, j9^, and its 

 muscles, p. ms. X 36, Page 52. 



Fig. 52. View of the cesophagus of a worker of M. hortus- 

 deorum. One side of the thorax and petiole are cut awaj' in order 

 to show the oesophagus in site. X 18, Page 53. 



Fig. 53. Abdomem of hone}^ ant, showing the segmental plates 

 both dorsal (D) and ventral (V) in normal conditi(m of the crop. 

 X 16, Page 53. 



Fig. 54. Same, when separated by partly expanded crop. 

 Page 53. 



Plate YIII. 



Fig. 55. Entire crop with gizzard and stomach. Dissected 

 from a honey -bearer with morbid abdomen. X 14, Page 53. 



Fig. 56. Crop, gizzard, stomach, malpighian tubes and intestine. 

 From honey-bearer. X 14, Page 54. 



Fig. 51. Enlarged view of gizzard. X 50, Page 55. 



Fig. 58. After Forel. Topographic, somewhat diagrammatic 

 representation of the organs opening into the cloaca of Botlirio- 

 myrmex meridionalis g, enlarged 18 times. 



4, 5 and 6, optical section of the tergal chitinous pieces of what 

 are reallj?^ the 4th, 5th and 6th abdominal segments (nodes of the 

 petiolus reckoned as one segment). Opposite and beneath there 

 are shown the sterna of the corresponding segments. <Zo, dorsal 

 vessel; an. u, right anal vesicle; an. gl, right anal gland; Can, 

 intestinal canal (intestine and rectum) ; po. v, poison vesicle with 

 gland ; ac. gl, accessory gland of the poison apparatus ; Ou, rudi- 

 mentary ovaries with vagina ; ab. g, the last three abdominal 

 ganglia of the ventral cord with their commissures. 



Between 6 and the corresponding sternal plate (6'), lies a cleft 

 (shown wide open in the figure) which leads into the cavity of the 

 cloaca. In this cavity one finds, reckoning downwards from 6 

 to 6': 



1. 0, the common openiiig of the anal vesicles. 2. an, anus 

 (opening of rectum). 3. r. st, rudimentar}^ sting, into which the 

 poison vesicle opens, and then lower down, the accessory gland of 

 the poison apparatus. 4. o. sa, opening of the rudimentary fgmale 

 sexual apparatus. 



Fig. 59. Crop in normal condition, from a virgin queen. The 

 junction, j», of the abdomen with the petiole is bent over, showing 



