lO OHIO STATE ACADEMY OF SCIENCE. 



In order to study certain parts closely and locate their boun- 

 daries it is necessary to remove the vestiture which is most abund- 

 ant on the face and sides of the thorax. 



Head of female. The anterior part of the head is largely 

 occupied by the compound eyes which are brown in color, and 

 each is crossed transversely by two narrow, slightly curved, green- 

 ish or purplish bands. 



The antennae are located on the lower middle of the head, 

 and each is composed of three segments of which the third bears 

 near its base an angular prominence which may be called the 

 upper angle or basal prominence of the third antennal segment. 

 Also this segment is compound, being composed of five annula- 

 tions of which the basal one is longer than the other four taken 

 together. 



The front or frons, which is the region between the eyes 

 above the antennae is nearly of the same width throughout. The 

 space just above the antennae, the sub callus, is pollinose in this 

 species. Above the subcallus is the frontal callosity, which is 

 naked and shining, and occupies nearly the whole width of the 

 lower part of the front. It is quadrangular in form, with a nar- 

 row elongate extension upward from its superior side. 



The upper part of the front is the vertex, and the limit of 

 the front above is the vertical margin. The face occupies the 

 space bounded by the antennae, eyes and oral margin. 



The middle part 6i the face beneath the antennae is swollen, 

 while on each side is a less elevated area known as the cheek.. 

 The lower part of the face passes to the oral margin and the 

 proboscis. The part of the proboscis which is visible in nature 

 is largely labium. 



The labium is grooved on the upper side, and into this groove 

 the other mouth parts, with the exception of the palpi, are re- 

 ceived. It may be likened to a sheath for the edges of the groove 

 are extended and meet above, for at least a part of the length. 

 Its distal part is furnished with an enlargement, the labella, which 

 when the insect is taking food becomes a sucking disk. 



The mouth parts which are received into the groove of the 

 labium consist of six stylets, which are light brown in color and 

 otherwise resemble one another. If these be separated from the 

 labium, the labrum may be seen farthest forward and just behind it 

 the smaller hypopharynx. Next in order passing backwards are 

 the mandibles lying side by side while the maxillae the narrow- 

 est of the mouth parts lie posterior to the mandibles. Each 

 maxilla has attached to its base a large maxillary palp, which is 

 composed of a shorter basal, and a larger and longer distal joint. 

 These maxillary palps in their natural position are very promi- 



