BY W. R. COLLEDGE. '19 



tips are indented deeply, making straight marginal teeth. A 

 fine tube appears to run down the centre to the point. This is 

 probably the channel by which the poison is injected into the 

 wound. These central lancets are prolonged into the mouth, 

 widening into a trumpet-like chamber, which receives the end 

 of the tube connected with the stomach. They are likewise 

 attached laterally by two horny projections to muscles in the 

 head, which seem capable of thrusting these lancets deeper, or 

 withdrawing them from the wound. From the oral surface, 

 the lancets measure one hundredth of an inch in length. 



There is a probability that only the female sandfly attacks 

 man. I have never found a male insect upon me. At the Tweed 

 Eiver one afternoon I caught about fifty on my hands, but there 

 was not one male among them. Every specimen was of the 

 feminine gender. So that what is broadly true of tbe mosquito 

 — that only females attack man— seems to hold good with this 

 little insect too. 



The thorax is dark brown, almost bare on the dorsal aspect, 

 with scattered golden hairs on the sides. The parts are welded 

 together so that it forms a concave shield extending from the 

 neck to the abdomen, with a well defined border along the 

 sides. In shape it is not unlike the shell of a tortoise. On the 

 part near the head are two angular apertures for the admission 

 ■of air — the prothoracic spiracles. 



Below the lateral border arise the wings, they are oval, the 

 posterior border being abruptly rounded below the axilla, and 

 densely covered with black hairs. No marginal cross vein is 

 visible, and the only transverse one is in the axilla, where 

 passing above the curve formed by the junction of the roots of 

 the third and fifth longitudinals, it unites the first to the sixth. 



The first longitudinal arises from the root of and on a level 

 with the costal. Curving downwards, it runs parallel, and then 

 unites with the costal at a point a little on its side of centre of 

 the wing. Both these veins are very much thickened. A second 

 longitudinal proceeds parallel from the middle of the axillary 

 joint to a point two -thirds of the length of the first, where it 

 turns up abruptly to coalese with it, forming a thickened rib 

 which terminates in a club-like form on the costal border. 

 Immediately beyond this is a marginal pale U-shaped spot where 

 the hairs are thinly scattered. This is most distinctly visible 

 when examing the insect in a natural state. 



