. Un traité sur les insectes nuisibles à la végétation . Les insectes nuisibles. 610 DIPTEEA. les yeux, et ce dernier repéré, avec blanc jaunâtre. Les pattes sont jaune-ocre, sauf les jarrets et les pieds de la première paire, qui sont noires. Son rig-268- -u J 1 *j'. corps mesure près de trois quar- ters d'un pouce de longueur. Mon Sphecomyia undata (Fig. 268) a la forme d'un Sphex ou de boue-WASP. Il est d'un brun clair, couleur plus foncée sur le dos, et sur le milieu des cuisses et shanks ; sa tête est conique, et les ours l'antenne ? Sur l'extrémité du cône ; ses ailes sont brun foncé sur la partie externe, wit

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. A treatise on some of the insects injurious to vegetation . Insect pests. 610 DIPTEEA. the eyes, and the latter spotted, with yellowish white. The legs are ochre-yellow, except the shanks and feet of the first pair, which are black. Its rig-268- -u J 1 *i. body measures nearly three quar- ters of an inch in length. My Sphecomyia undata (Fig. 268) has the slender form of a Sphex or mud-wasp. It is of a light-brown color, darker on the back, and on the middle of the thighs and shanks; its head is conical, and bears the antenna? on the tip of the cone; its wings are brown on the outer part, with a small transparent spot near the edge, and the inner part is transparent in two large wavy spaces. It is about five eighths of an inch long, and its wings expand one inch and a quarter, or more. It is possible that this singular fly may be the Pyrgota undata of Wiedemann.8 An insect closely tellum. Pleura with an elongated yellow spot. ScuteUum brassy.green, metalles- cent. Poisers pale ferruginous. Legs yellowish ferruginous, fore tibia (excepting the knees) and tarsi black. Simd thighs unarmed. Wings tinged with gray and brown ; a pale stripe along the latter part of the cubital vein;. another runs along the pobrachial area and reaches the posterior margin. Abdomen yellow; first seg- ment black; the three following segments have more or less black at the incis- ures along the fore border, and a black band, attenuated at both ends, and not reaching the lateral borders, in the middle; the band on the second segment is the broadest; and is sometimes connected with the black of the first segment; those of the third and fourth segments are interrupted in the middle. Venter yellow, with large black spots on the middle of the segments; sexual organs pale ferruginous. Female: shows the following differences: front yellow, with a black stripe ex- tending towards the black vertex. Beside the three pairs of spots already men- tioned on the thorax, there is a fourth pair in the middle

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