INTRODUCTION. XXXIU 



21. Last joint of tarsi long, claws large. (p. 162) Paknid/e. 

 Last joint of tarsi moderate, claws usual. (p. 130) Ruyssouida-. 



22. Antennae regular, legs not fossorial. (p. 125) Colydiid/e. 

 Antennje short, irregular, legs fossorial. (p. 166) llETERocEiiiDiE. 



Of the numerous families of the Clavicorn series but few are 

 not represented in our fuiuia, these are : I'aussidse, Gnostid®, 

 HypoeeplialidtB, and Thorietidte. These families are all more or 

 less synthetic, and it is extremely difficult to define their relation- 

 ships. The Paussidse seem in many respects the nearest approach 

 of the Clavicorns to the Adeplinga. They are distinguished by 

 the globular front and middle coxie, and by having four ventral 

 segments only. The Gnostidaj seem intermediate between the 

 PaussidiE and Pselaphid*; they have five* ventral segments, the 

 first three connate, the sutures visible only at the sides; the 

 anterior coxte are conical, i)roniinent, and conligiious, the middle 

 globular and separated, the posterior transversely oval and dis- 

 tant; the tarsi have four joints, the antennae three. The affini- 

 ties of Hypocephalidaj have been the subject of a paper by Dr. 

 LeConte (Trans. Amer. Ent. Soc, 1876, pp. 209-218), in which 

 while the relationship of Ilypocephalus with the Sili)hida;, Cu- 

 cujidae, and Rbyssodidaj, as expressed by previous authors, is 

 recognized, there is also an indication of certain Rhyncliophorous 

 affinities through the Brenthidae. The Thorictida? have relation- 

 ship well expressed with the Cryptophagidse, but more feebly with 

 the Dermestidas; the abdomen has five ventral segments, the first 

 very long. 



SERRICORNIA. 



This series connects very closely with the Clavicornia, so tliat 

 several of its members have been included in that table. It will 

 be observed that in no part of this series do the tarsi depart 

 from the pentamerous type, except in two families, Cioidte and 

 Sphindidai, in which (also in the LyctinsR and some Cleridie) 

 the closest approach is made to the Clavicorn series. 



* (hiostusformictcolaWw. (Trans. Ent. Soc. London, n. s., vol. iii. p. 92), 

 is described as having })ut threes ventral segments, but we liave observed 

 that the first segment is really composed of three which are completelv 

 connate at middle without trace of suture ; at the sides, however, the 

 sutures are quite evident, and indicate that the first three segments are 

 suhequal. 

 C 



