3° 2 The Ohio Naturalist. [Vol. Ill, No. 1, 



two prominent curved spines on its anterior end. ( )n the tip of 

 tlie stipes and between the palp and the lacinia is the galea ( 7' ) 

 covered with bristles and ending- in an incurved si)ine. It is some- 

 what shorter than the palp and longer than the lacinia. The labium 

 (8'-9') lies on the median ventral surface and is attached pos- 

 teriorly to the anterior margin of thesubmentum, and lies between 

 the lateral projections of the submentum and under the labrum. 

 The parts which are separate in other beetles seem to be fused in 

 this. The labium seems to be composed of mentum ( 8' ) ligula 

 (9') and paraglossa fused. The palp is as in other forms. The 

 proximal portion ( 8' ) probably corresponds to the mentum, the 

 median anterior spine to the ligula ( 9' ) and the rounded lateral 

 elevations lying on either side of the spine to the paraglossa ; the 

 palp is three-jointed. 



THE PRO-THORAX. 



The following definitions should be kej^t in mind : A typical 

 body segment of an insect is composed of four main pieces or 

 sclc rites. The dorsal portion is called the tergum. The side pieces 

 are called pleura and bear spiracles when present. The pleuron is 

 divided into two smaller sclerites, the anterior or episternum and 

 posterior or epimeron : owing to the flattening of the body dorso- 

 A'CUl rally in beetles the sclerites of the pleura lie on the ventral 

 surir.ce. The ventral portion of the segment is called the sternum 

 and is usually modified according to the size and method of articu- 

 lation of the limb. The dorsal portion or tergum is also similarly 

 modified by the attachment of the wing. 



The pro-notum (4-7) or pro-thoracic tergum, is a smooth 

 rectangular sclerite covering the dorsal surface of the pro-thorax. 

 It is divided into right and left halves by a longitudinal suture. 

 Anteriorly it ends in a sharp border, Init laterally and posteriorly 

 it is inflexed to unite with the sclerite forming the ventral wall of 

 tlie body. 



The prosteinum ( 1 ) occupies tlie median ventral porti ;n of 

 tl-ic pro-thorax. It is compressed in the middle region between the 

 l^rc-thoracic coxae and expands posteriorly into a small diamond- 

 shaped piece. .Anteriorly it expands almost to theMateral border 

 of the coxal cavities. The suture limiting the lateral area of the 

 anterior end of the pro-sternum is A'-sha])ed, the apex of the Y 

 pointing toward the median line. The transverse depression on 

 the median anterior portion is not a suture but is the remnant of 

 tVe fold where tlie articular portion of the ])ro-stemu;n was 

 ■doubled under in the ])upa. 



The pleuron is usually composed of two sclerites. the anter- 

 iorly located e])isternum, the posteriorly located epimeron. and 

 sometimes a third dorsally located epipleuron. In I'assalus they 



