BY W. R. COLLEDGE. 21 



hairs, seemingly connected with some special sense. Most 

 likely they are olfactory cones, or organs of smell. Insects often 

 have sense organs in what are to us unlikely places. For 

 instance, the locust has an ear on the leg. And it is not 

 improbable that they have senses differing from any that we 

 possess. 



The abdomen is composed of the. usual chitinovis segments 

 found in insects. The dorsal aspect is of a dark brown colour, 

 with a narrow grey bar separating the segments, which also 

 extends like a stripe along the sides. This lighter portion is 

 capable of considerable expansion, when the eggs are enlarged 

 in the ovaries. Long curved hairs, black in colour, are scattered 

 over ihe parts, being longer in the male body. In his case the 

 last segment terminates in a pair of hooks called claspers, while 

 in the female a pair of fleshy lobes are found, which are used in 

 placing the eggs in position outside of the body. 



Passing now into the interior of the body the most inter- 

 esting to us are the salivary and poison glands. These are the 

 organs which render the insect so noticeable and mischevious. 

 The mere prick of its tiny lancets would never be noticed but 

 for the injection of the fluid from these glands into the wound. 

 Two of these are found lying in the prothorax. You see one in 

 one of the photographs attached to the head by the poison tube, 

 and appearing like a tiny balloon. It only measures the four- 

 hundredth part of an inch in length, and takes the form of a 

 roundish pear. Interiorly, it is filled with granular matter 

 which stains readily, more especially on the circumference. 

 The long tube by which they are attached to the neck is ringe i 

 internally and expands in width as it approaches the gland. In 

 the mosquito the veneno salivary gland divides into three distinct 

 lobes, each having its own separate tubule ; but here each gland 

 consists of but one lobe. At its base, two tiny buds are seen, 

 which may possibly be the analogues of the others found in the 

 mosquito. 



At the base of the central lancet lies the aesophagus, or 

 gullet, a stout muscular tube, in which, coupled with capillary 

 attraction, the blood-sucking power rests. Towards the lower 

 part it widens to unite with the stomach. This organ, when 

 empty, is usually found thrown into longitudinal folds, and the large 

 epitheiral cells with which it is lined are easily traceable through 

 its walls. At its lower end it slightly thickens encircling the 

 base by a rim, and from this spring two very long Malpighian 

 tubes. They lie upon the outside of the stomach, folded three 



