282 [Senate 



black band surrounding the head, and interrrupted only below at the 

 tnouth, thus resembling a horse shoe in their figure. The face 

 2s pale yellow. In its centre, and contiguous to each other, are two 

 pale yellow tubercles or spherical eminences, more or less conspicu- 

 ous, on which the antennae are inserted, and which are by some re* 

 garded as forming a joint of these organs, in addition to the number 

 commonly stated. The antenn(B are of a deep brown or black color, 

 less intense than the eyes. They are of about the same length as 

 the body, and composed of twelve joints. Each joint (Plate, fig. h) 

 is commonly oblongs with a marked contraction in its middle, a shape 

 which is sometimes designated as '' coarctiform," and is surrounded 

 with a whirl or row of hairs near its base, and another near its apex.* 

 The joints are ordinarily about thrice as long as they are broad, their 

 diameter being but little less than that of the legs. They are connected 

 together by a slender thread intervening between each joint, and about 

 a fourth as long as the joints themselves. The two palpi are pale 

 yellow, and clothed with shortish hairs: each is composed of four oval 

 joints; the one terminal being longer, but of the same diameter with 

 the preceding. 



The THORAX is of a pale yellow color ; its upper side commonly 

 tinged with fulvous brown, which sometimes, though rarely, forms 

 three vittse or longitudinal spots forw'ard to the middle. It is of an 

 ovate form, its greatest breadth being immediately back of the wing 

 sockets. Its vertical diameter much exceeds the transverse, as is 

 common in most species of Tipulidm^ the breast jutting down far 

 below the level of the head and abdomen. The poisers are oVal, 

 honey-yellow, their pedicels with a strong notch in the middle of 

 their anterior sides b 



The ABDOMEN throughout is of an orange color, more inclining to 

 red than to yellow. Its broadest part scarcely equals the thorax in 



*Not unfrequently, however, singular anomalies occur in these joints. Thus in 

 some the contraction will he so considerable as to cause the segment to appear like 

 two globular joints slightly hut distinctly separate from each other; whilst other seg- 

 ments of the same series are abbreviated and dilated, the usual contraction thus becom- 

 ing obsolete, and the joint taking on a short cj'lindrical form. It would thus seem as 

 though we, in the female, met with twenty-four joints of the male attennse in a 

 modified or imperfectly developed condition ; that what appears as a single oblong 

 coarctiform joint, is in reality two joints united. This would give but a single whirl 

 of hairs to each joint, as is common in most of the species of this genus. 



