They give the speaker a sense of place geographically though not a sense of belonging. During this stanza, though not described in flattering terms, they are at least something recognisable.
During the day he comments on some of the famous building of the New York skyline that he can see from his window.
You want the reader to be able to follow your trail of thought and this is easier when the essay is linked correctly.
Insects also are often found around decaying remains so the image reminds us of death and dying. Metaphor: the idea of midnight and the unknown attacking the speaker and civilisation continues to the end of the poem.
This links with the sense of isolation established in the title. There is no Comtech support for warranty or repair service or spare parts for this modem.
A troposcatter system is a point-to-point link that requires a terminal on each end, with each terminal both transmitting and receiving. It is also set in New York and has themes of violence.
PanAm - The national airline of U.