1929 ] Use of Terms Parapsides and Parapsidal Furroivs 381 
ence of this median line is of minor significance since it is 
used in the classification of only one group of Hymenoptera. 
However, its presence along with the notauli and parapsidal 
furrows illustrates the complete number of longitudinal 
lines of furrows that have been observed on the mesonotum 
of Hymenoptera. 
Much of the confusion existing in the literature has re- 
sulted from the mistaken impression that the terms parap- 
sidal furrows and notauli are synonymous. From the fore- 
going discussion it should be clear that this is not the case, 
since they are two distinct pairs of furrows, each pair so 
completely localized in position and possessing such distinct 
characteristics that misidentification should be impossible. 
The terms discussed may be defined as follows : 
1. Parapsidal furrows — longitudinal furrows extending 
anteriorly from the posterior region of the mesonotum or 
from the transcutal suture of the mesoscutum and varying 
in length and in their course from one approximating paral- 
lel lines to one which is strongly divergent but very rarely, 
if ever, converging from the original point in the posterior 
region of the mesonotum. 
2. Parapsides — (sing, parapsis) lateral regions delim- 
ited by the parapsidal furrows and the tegulae. 
3. Notauli — (sing, notaulus) longitudinal furrows ex- 
tending posteriorly from the anterior margin of the meso- 
notum, varying in length and in angle of convergence, and 
occasionally approximating parallel lines but rarely, if ever, 
diverging in their course from the anterior margin of the 
mesonotum. 
Bibliography 
Crampton, G. C. 1926. A phylogenetic study of the thoracic 
sclerites of the Psychodoid Diptera with remarks on 
the inter-relationships of the Nematocera. Ent. News, 
vol. 37, p. 33. 
Dalla Torre. 1904. Vespidse, Gen. Inc., Fasc. 19. 
Emery, C. 1900. Intorno al Torace delle Formiche. Bull. 
Soc. Ent. Ital. 32 : 1-17, 14 figs. 
